chore: workflow: handle manual bootstrap

scripts used by the cron vuln-watch workflow
from the master branch.

.github/workflows/check.yml

@@ -1,73 +0,0 @@
-name: CI
-
-on: [push, pull_request]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: install prerequisites
-      run: sudo apt-get update && sudo apt-get install -y shellcheck jq sqlite3 iucode-tool
-    - name: shellcheck
-      run: shellcheck -s sh spectre-meltdown-checker.sh
-    - name: check indentation
-      run: |
-        if [ $(grep -cPv "^\t*\S|^$" spectre-meltdown-checker.sh) != 0 ]; then
-          echo "Badly indented lines found:"
-          grep -nPv "^\t*\S|^$" spectre-meltdown-checker.sh
-          exit 1
-        else
-          echo "Indentation seems correct."
-        fi
-    - name: check direct execution
-      run: |
-        expected=15
-        nb=$(sudo ./spectre-meltdown-checker.sh --batch json | jq '.[]|.CVE' | wc -l)
-        if [ "$nb" -ne "$expected" ]; then
-          echo "Invalid number of CVEs reported: $nb instead of $expected"
-          exit 1
-        else
-          echo "OK $nb CVEs reported"
-        fi
-    - name: check docker-compose run execution
-      run: |
-        expected=15
-        docker-compose build
-        nb=$(docker-compose run --rm spectre-meltdown-checker --batch json | jq '.[]|.CVE' | wc -l)
-        if [ "$nb" -ne "$expected" ]; then
-          echo "Invalid number of CVEs reported: $nb instead of $expected"
-          exit 1
-        else
-          echo "OK $nb CVEs reported"
-        fi
-    - name: check docker run execution
-      run: |
-        expected=15
-        docker build -t spectre-meltdown-checker .
-        nb=$(docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker --batch json | jq '.[]|.CVE' | wc -l)
-        if [ "$nb" -ne "$expected" ]; then
-          echo "Invalid number of CVEs reported: $nb instead of $expected"
-          exit 1
-        else
-          echo "OK $nb CVEs reported"
-        fi
-    - name: check fwdb update
-      run: |
-        nbtmp1=$(find /tmp 2>/dev/null | wc -l)
-        ./spectre-meltdown-checker.sh --update-fwdb; ret=$?
-        if [ "$ret" != 0 ]; then
-          echo "Non-zero return value: $ret"
-          exit 1
-        fi
-        nbtmp2=$(find /tmp 2>/dev/null | wc -l)
-        if [ "$nbtmp1" != "$nbtmp2" ]; then
-          echo "Left temporary files!"
-          exit 1
-        fi
-        if ! [ -e ~/.mcedb ]; then
-          echo "No .mcedb file found after updating fwdb"
-          exit 1
-        fi

.gitignore

@@ -0,0 +1,4 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/

Dockerfile

@@ -1,7 +0,0 @@
-FROM alpine:3.7
-
-RUN apk --update --no-cache add kmod binutils grep perl
-
-COPY . /check
-
-ENTRYPOINT ["/check/spectre-meltdown-checker.sh"]

README.md

@@ -1,180 +0,0 @@
-Spectre & Meltdown Checker
-==========================
-
-A shell script to tell if your system is vulnerable against the several "speculative execution" CVEs that were made public since 2018.
-- CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
-- CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
-- CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
-- CVE-2018-3640 [rogue system register read] aka 'Variant 3a'
-- CVE-2018-3639 [speculative store bypass] aka 'Variant 4'
-- CVE-2018-3615 [L1 terminal fault] aka 'Foreshadow (SGX)'
-- CVE-2018-3620 [L1 terminal fault] aka 'Foreshadow-NG (OS)'
-- CVE-2018-3646 [L1 terminal fault] aka 'Foreshadow-NG (VMM)'
-- CVE-2018-12126 [microarchitectural store buffer data sampling (MSBDS)] aka 'Fallout'
-- CVE-2018-12130 [microarchitectural fill buffer data sampling (MFBDS)] aka 'ZombieLoad'
-- CVE-2018-12127 [microarchitectural load port data sampling (MLPDS)] aka 'RIDL'
-- CVE-2019-11091 [microarchitectural data sampling uncacheable memory (MDSUM)] aka 'RIDL'
-- CVE-2019-11135 [TSX asynchronous abort] aka 'TAA' aka 'ZombieLoad V2'
-- CVE-2018-12207 [machine check exception on page size changes (MCEPSC)] aka 'No eXcuses' aka 'iTLB Multihit'
-- CVE-2020-0543 [Special Register Buffer Data Sampling (SRBDS)]
-
-Supported operating systems:
-- Linux (all versions, flavors and distros)
-- BSD (FreeBSD, NetBSD, DragonFlyBSD)
-
-Supported architectures:
-- x86 (32 bits)
-- amd64/x86_64 (64 bits)
-- ARM and ARM64
-- other architectures will work, but mitigations (if they exist) might not always be detected
-
-For Linux systems, the script will detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number and the distribution (such as Debian, Ubuntu, CentOS, RHEL, Fedora, openSUSE, Arch, ...), it also works if you've compiled your own kernel.
-
-For BSD systems, the detection will work as long as the BSD you're using supports `cpuctl` and `linprocfs` (this is not the case of OpenBSD for example).
-
-## Easy way to run the script
-
-- Get the latest version of the script using `curl` *or* `wget`
-
-```bash
-curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh
-wget https://meltdown.ovh -O spectre-meltdown-checker.sh
-```
-
-- Inspect the script. You never blindly run scripts you downloaded from the Internet, do you?
-
-```bash
-vim spectre-meltdown-checker.sh
-```
-
-- When you're ready, run the script as root
-
-```bash
-chmod +x spectre-meltdown-checker.sh
-sudo ./spectre-meltdown-checker.sh
-```
-
-### Run the script in a docker container
-
-#### With docker-compose
-
-```shell
-docker-compose build
-docker-compose run --rm spectre-meltdown-checker
-```
-
-#### Without docker-compose
-
-```shell
-docker build -t spectre-meltdown-checker .
-docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker
-```
-
-## Example of script output
-
-- Intel Haswell CPU running under Ubuntu 16.04 LTS
-
-![haswell](https://framapic.org/1kWmNwE6ll0p/ayTRX9JRlHJ7.png)
-
-- AMD Ryzen running under OpenSUSE Tumbleweed
-
-![ryzen](https://framapic.org/TkWbuh421YQR/6MAGUP3lL6Ne.png)
-
-- Batch mode (JSON flavor)
-
-![batch](https://framapic.org/HEcWFPrLewbs/om1LdufspWTJ.png)
-
-## Quick summary of the CVEs
-
-**CVE-2017-5753** bounds check bypass (Spectre Variant 1)
-
-   - Impact: Kernel & all software
-   - Mitigation: recompile software *and* kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code
-   - Performance impact of the mitigation: negligible
-
-**CVE-2017-5715** branch target injection (Spectre Variant 2)
-
-   - Impact: Kernel
-   - Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors)
-   - Mitigation 2: introducing "retpoline" into compilers, and recompile software/OS with it
-   - Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU
-
-**CVE-2017-5754** rogue data cache load (Meltdown)
-
-   - Impact: Kernel
-   - Mitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough
-   - Performance impact of the mitigation: low to medium
-
-**CVE-2018-3640** rogue system register read (Variant 3a)
-
-   - Impact: TBC
-   - Mitigation: microcode update only
-   - Performance impact of the mitigation: negligible
-
-**CVE-2018-3639** speculative store bypass (Variant 4)
-
-   - Impact: software using JIT (no known exploitation against kernel)
-   - Mitigation: microcode update + kernel update making possible for affected software to protect itself
-   - Performance impact of the mitigation: low to medium
-
-**CVE-2018-3615** l1 terminal fault (Foreshadow-NG SGX)
-
-   - Impact: Kernel & all software (any physical memory address in the system)
-   - Mitigation: microcode update
-   - Performance impact of the mitigation: negligible
-
-**CVE-2018-3620** l1 terminal fault (Foreshadow-NG SMM)
-
-   - Impact: Kernel & System management mode
-   - Mitigation: updated kernel (with PTE inversion)
-   - Performance impact of the mitigation: negligible
-
-**CVE-2018-3646** l1 terminal fault (Foreshadow-NG VMM)
-
-   - Impact: Virtualization software and Virtual Machine Monitors
-   - Mitigation: disable ept (extended page tables), disable hyper-threading (SMT), or updated kernel (with L1d flush)
-   - Performance impact of the mitigation: low to significant
-
-**CVE-2018-12126** [MSBDS] Microarchitectural Store Buffer Data Sampling (Fallout)
-
-**CVE-2018-12130** [MFBDS] Microarchitectural Fill Buffer Data Sampling (ZombieLoad)
-
-**CVE-2018-12127** [MLPDS] Microarchitectural Load Port Data Sampling (RIDL)
-
-**CVE-2019-11091** [MDSUM] Microarchitectural Data Sampling Uncacheable Memory (RIDL)
-
-   - Note: These 4 CVEs are similar and collectively named "MDS" vulnerabilities, the mitigation is identical for all
-   - Impact: Kernel
-   - Mitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data
-   - Performance impact of the mitigation: low to significant
-
-**CVE-2019-11135** TSX Asynchronous Abort (TAA, ZombieLoad V2)
-
-   - Impact: Kernel
-   - Mitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data
-   - Performance impact of the mitigation: low to significant
-
-**CVE-2018-12207** machine check exception on page size changes (No eXcuses, iTLB Multihit)
-
-   - Impact: Virtualization software and Virtual Machine Monitors
-   - Mitigation: disable hugepages use in hypervisor, or update hypervisor to benefit from mitigation
-   - Performance impact of the mitigation: low to significant
-
-**CVE-2020-0543** Special Register Buffer Data Sampling (SRBDS)
-
-   - Impact: Kernel
-   - Mitigation: microcode update + kernel update helping to protect various CPU internal buffers from unprivileged speculative access to data
-   - Performance impact of the mitigation: low
-
-## Understanding what this script does and doesn't
-
-This tool does its best to determine whether your system is affected (or has proper mitigations in place) by the collectively named "speculative execution" vulnerabilities. It doesn't attempt to run any kind of exploit, and can't guarantee that your system is secure, but rather helps you verifying whether your system has the known mitigations in place.
-However, some mitigations could also exist in your kernel that this script doesn't know (yet) how to detect, or it might falsely detect mitigations that in the end don't work as expected (for example, on backported or modified kernels).
-
-Your system exposure also depends on your CPU. As of now, AMD and ARM processors are marked as immune to some or all of these vulnerabilities (except some specific ARM models). All Intel processors manufactured since circa 1995 are thought to be vulnerable, except some specific/old models, such as some early Atoms. Whatever processor one uses, one might seek more information from the manufacturer of that processor and/or of the device in which it runs.
-
-The nature of the discovered vulnerabilities being quite new, the landscape of vulnerable processors can be expected to change over time, which is why this script makes the assumption that all CPUs are vulnerable, except if the manufacturer explicitly stated otherwise in a verifiable public announcement.
-
-Please also note that for Spectre vulnerabilities, all software can possibly be exploited, this tool only verifies that the kernel (which is the core of the system) you're using has the proper protections in place. Verifying all the other software is out of the scope of this tool. As a general measure, ensure you always have the most up to date stable versions of all the software you use, especially for those who are exposed to the world, such as network daemons and browsers.
-
-This tool has been released in the hope that it'll be useful, but don't use it to jump to conclusions about your security.

docker-compose.yml

@@ -1,15 +0,0 @@
-version: '2'
-
-services:
-  spectre-meltdown-checker:
-    build:
-      context: ./
-      dockerfile: ./Dockerfile
-    image: spectre-meltdown-checker:latest
-    container_name: spectre-meltdown-checker
-    privileged: true
-    network_mode: none
-    volumes:
-      - /boot:/boot:ro
-      - /dev/cpu:/dev/cpu:ro
-      - /lib/modules:/lib/modules:ro

scripts/daily_vuln_watch_prompt.md

@@ -0,0 +1,266 @@
+# Daily transient-execution vulnerability scan — classification step
+
+You are a scheduled agent running inside a GitHub Actions job. A preceding
+workflow step has already fetched all configured sources, applied HTTP
+conditional caching, deduped against prior state, and written the pre-filtered
+list of new items to `new_items.json`. Your only job is to classify each item.
+
+## Scope — read the authoritative docs before classifying
+
+The project's own docs define what belongs in this tool. **Read them early
+in the run** (once per run; Claude caches, these don't change daily):
+
+1. **`./checker/DEVELOPMENT.md`** — "Project Mission" section. What the
+   script does, what it explicitly does not do, its platform scope
+   (Linux + BSD on x86/amd64/ARM/ARM64).
+2. **`./checker/dist/doc/FAQ.md`** — the section titled
+   _"Which rules are governing the support of a CVE in this tool?"_.
+   This is the **operative test**:
+   > A CVE belongs in scope when mitigating it requires **kernel
+   > modifications, microcode modifications, or both** — and those
+   > modifications are **detectable** by this tool (no hardcoded kernel
+   > versions; look for actual mechanisms).
+3. **`./checker/dist/doc/UNSUPPORTED_CVE_LIST.md`** — explicit list of
+   CVEs ruled out, grouped by reason:
+   - _Already covered by a parent CVE check_ (e.g. SpectreRSB ⊂ Spectre V2).
+   - _No detectable kernel/microcode mitigation_ (vendor won't fix, GPU
+     driver-only, userspace-only, etc.).
+   - _Not a transient / speculative execution vulnerability at all_.
+
+Match incoming items against those exclusion patterns. If a CVE is a
+subvariant of a covered parent, or has no kernel/microcode mitigation
+this tool can detect, or is simply not a transient-execution issue, it
+is **unrelated** — not `tocheck`. Out-of-scope items with zero ambiguity
+should not linger in the `tocheck` backlog.
+
+In-scope shortlist (for quick reference; the README's CVE table is the
+authoritative source): Spectre v1/v2/v4, Meltdown, Foreshadow/L1TF,
+MDS (ZombieLoad/RIDL/Fallout), TAA, SRBDS, iTLB Multihit, MMIO Stale
+Data, Retbleed, Zenbleed, Downfall (GDS), Inception/SRSO, DIV0, Reptar,
+RFDS, ITS, TSA-SQ/TSA-L1, VMScape, BPI, FP-DSS — and similar
+microarchitectural side-channel / speculative-execution issues on
+Intel / AMD / ARM CPUs with a detectable mitigation.
+
+Explicitly out of scope: generic software CVEs, GPU driver bugs,
+networking stacks, filesystem bugs, userspace crypto issues, unrelated
+kernel subsystems, CPU bugs that the industry has decided not to mitigate
+(nothing for the tool to check), and CVEs fixed by userspace/SDK updates
+only.
+
+## Inputs
+
+- `new_items.json` — shape:
+
+  ```json
+  {
+    "scan_date": "2026-04-18T14:24:43+00:00",
+    "window_cutoff": "2026-04-17T13:24:43+00:00",
+    "per_source": { "phoronix": {"status": 200, "new": 2, "total_in_feed": 75} },
+    "items": [
+      {
+        "source": "phoronix",
+        "stable_id": "CVE-2026-1234",
+        "title": "...",
+        "permalink": "https://...",
+        "guid": "...",
+        "published_at": "2026-04-18T05:00:00+00:00",
+        "extracted_cves": ["CVE-2026-1234"],
+        "vendor_ids": [],
+        "snippet": "first 400 chars of description, tags stripped"
+      }
+    ],
+    "reconsider": [
+      {
+        "canonical_id":   "INTEL-SA-00145",
+        "current_bucket": "toimplement",
+        "title":          "Lazy FP State Restore",
+        "sources":        ["intel-psirt"],
+        "urls":           ["https://www.intel.com/.../intel-sa-00145.html"],
+        "extracted_cves": [],
+        "first_seen":     "2026-04-19T09:41:44+00:00"
+      }
+    ]
+  }
+  ```
+
+  - `items` are fresh observations from today's fetch: already inside the
+    time window and not yet present in state under any alt-ID.
+  - `reconsider` holds existing `toimplement`/`tocheck` entries from state,
+    submitted for re-review each run (see the "Reconsideration" section
+    below). On days where both arrays are empty, write stub output files
+    with `(no new items in this window)`.
+
+- `./checker/` is a checkout of the **`test`** branch of this repo (the
+  development branch where coded-but-unreleased CVE checks live). This is
+  the source of truth for whether a CVE is already covered. Grep this
+  directory — not the working directory root, which only holds the
+  vuln-watch scripts and has no checker code.
+
+## Classification rules
+
+For each item in `items`, pick exactly one bucket:
+
+- **toimplement** — clearly in-scope per the FAQ test (kernel/microcode
+  mitigation exists AND is detectable by this tool), and **not already
+  covered** by `./checker/`. Verify the second half: grep `./checker/`
+  for each `extracted_cves` entry *and* for any codename in the title
+  (e.g., "FP-DSS", "Inception"). If either matches, the right bucket is
+  `unrelated` (already covered) or `tocheck` (maintainer should confirm
+  whether an existing check handles the new variant).
+- **tocheck** — there is a **specific question a maintainer must answer**
+  before this can be filed anywhere else. Examples:
+  - Ambiguity about whether an existing check (e.g. parent Spectre V2)
+    transitively covers this new sub-variant, or whether a fresh entry
+    is warranted.
+  - Embedded-only ARM SKU and it's unclear if the tool's ARM support
+    reaches that class of SKU.
+  - Vendor advisory published without a CVE ID yet, but the vuln looks
+    in-scope; revisit once the CVE is assigned.
+  - Contradictory statements across sources about whether a mitigation
+    is detectable (kernel-patch vs. userspace-only vs. microcode).
+
+  **Do NOT use `tocheck` as a catch-all** for "I'm not sure". Most items
+  have a clear answer once you consult UNSUPPORTED_CVE_LIST.md and the
+  FAQ rule. If you can articulate the specific question a maintainer
+  needs to answer — `tocheck`. If the only reason is "maybe?" — it's
+  `unrelated`.
+
+- **unrelated** — everything else. Including:
+  - Matches a pattern in UNSUPPORTED_CVE_LIST.md (subvariant of covered
+    parent, no detectable mitigation, not transient-execution).
+  - Fails the FAQ rule (userspace-only fix, driver update, industry
+    decided not to mitigate).
+  - Non-CPU security topic (kernel filesystem bug, network stack, crypto
+    library, GPU driver, compiler flag change, distro release notes).
+
+**Tie-breakers** (note the direction — this used to bias the other way):
+- Prefer `unrelated` over `tocheck` when the item matches a category in
+  UNSUPPORTED_CVE_LIST.md or plainly fails the FAQ rule. Growing the
+  `tocheck` backlog with obvious-unrelateds wastes human time more than
+  a confident `unrelated` does.
+- Prefer `tocheck` over `toimplement` when the CVE is still "reserved" /
+  "pending" — false positives in `toimplement` create phantom work.
+
+`WebFetch` is available for resolving genuine `tocheck` ambiguity.
+Budget: **3 follow-ups per run total**. Do not use it for items you
+already plan to file as `unrelated` or `toimplement`.
+
+## Reconsideration rules (for `reconsider` entries)
+
+Each `reconsider` entry is an item *already* in state under `current_bucket`
+= `toimplement` or `tocheck`, from a prior run. Re-examine it against the
+**current** `./checker/` tree and the scope docs above. This pass is the
+right place to prune the `tocheck` backlog: prior runs (before these
+scope docs were wired in) may have hedged on items that now have a clear
+`unrelated` answer — demote them aggressively. You may:
+
+- **Demote** `toimplement` → `tocheck` or `unrelated` if the checker now
+  covers the CVE/codename (grep confirms), or if reinterpreting the
+  advisory shows it's out of scope.
+- **Demote** `tocheck` → `unrelated` if new context settles the ambiguity
+  as out-of-scope.
+- **Promote** `tocheck` → `toimplement` if you now have firm evidence it's
+  a real, in-scope, not-yet-covered CVE.
+- **Leave it unchanged** (same bucket) — emit a record anyway; it's cheap
+  and documents that the reconsideration happened today.
+- **Reassign the canonical ID** — if a CVE has since been assigned to a
+  vendor advisory (e.g., an INTEL-SA that previously had no CVE), put the
+  CVE in `extracted_cves` and use it as the new `canonical_id`. The merge
+  step will rekey the record under the CVE and keep the old ID as an alias.
+
+For every reconsider record you emit, set `"reconsider": true` in its
+classification entry — this tells the merge step to **overwrite** the
+stored bucket (including demotions), not just promote.
+
+## Outputs
+
+Compute `TODAY` = the `YYYY-MM-DD` prefix of `scan_date`. Write three files at
+the repo root, overwriting if present:
+
+- `watch_${TODAY}_toimplement.md`
+- `watch_${TODAY}_tocheck.md`
+- `watch_${TODAY}_unrelated.md`
+
+These delta files cover the **`items`** array only — they answer "what
+did today's fetch surface". Reconsider decisions update state (and surface
+in the `current_*.md` snapshots the merge step rewrites); don't duplicate
+them here.
+
+Each file uses level-2 headers per source short-name, then one bullet per
+item: the stable ID, the permalink, and 1–2 sentences of context.
+
+```markdown
+## oss-sec
+- **CVE-2026-1234** — https://www.openwall.com/lists/oss-security/2026/04/18/3
+  New Intel transient-execution bug "Foo"; affects Redwood Cove cores.
+  Not yet covered (grepped CVE-2026-1234 and "Foo" — no matches).
+```
+
+If a bucket has no items, write `(no new items in this window)`.
+
+Append the following block to the **tocheck** file (creating it if
+otherwise empty):
+
+```markdown
+## Run summary
+- scan_date: <value>
+- per-source counts (from per_source): ...
+- fetch failures (status != 200/304): ...
+- total classified this run: toimplement=<n>, tocheck=<n>, unrelated=<n>
+- reconsidered: <n> entries re-reviewed; <list any bucket transitions, e.g.
+  "CVE-2018-3665: toimplement -> tocheck (now covered at src/vulns/...)">,
+  or "no transitions" if every reconsider kept its existing bucket.
+```
+
+## `classifications.json` — required side-channel for the merge step
+
+Also write `classifications.json` at the repo root. It is a JSON array, one
+record per item in `new_items.json.items`:
+
+```json
+[
+  {
+    "stable_id":      "CVE-2026-1234",
+    "canonical_id":   "CVE-2026-1234",
+    "bucket":         "toimplement",
+    "extracted_cves": ["CVE-2026-1234"],
+    "sources":        ["phoronix"],
+    "urls":           ["https://www.phoronix.com/news/..."]
+  }
+]
+```
+
+Rules:
+
+- One record per input item (`items` + `reconsider`). For items, use the
+  same `stable_id` as in `new_items.json`. For reconsider entries, use the
+  entry's `canonical_id` from state as the record's `stable_id`.
+- `canonical_id`: prefer the first `extracted_cves` entry if any; otherwise
+  the item's `stable_id`. **Use the same `canonical_id` for multiple items
+  that are really the same CVE from different sources** — the merge step
+  will collapse them into one entry and add alias rows automatically.
+- **Populate `extracted_cves` / `canonical_id` from context when the feed
+  didn't.** If the title, body, or a well-known transient-execution codename
+  mapping lets you identify a CVE the feed didn't emit (e.g., "Lazy FP
+  State Restore" → `CVE-2018-3665`, "LazyFP" → same, "FP-DSS" → whatever
+  CVE AMD/Intel assigned), put the CVE in `extracted_cves` and use it as
+  `canonical_id`. This prevents Intel's CVE-less listing entries from
+  creating orphan `INTEL-SA-NNNNN` records in the backlog.
+- `sources` / `urls`: arrays; default to the item's own single source and
+  permalink if you didn't enrich further.
+- **`reconsider: true`** — set on every record that corresponds to an
+  input from the `reconsider` array. The merge step uses this flag to
+  overwrite the stored bucket instead of merging by "strongest wins" —
+  this is what enables demotions.
+- If both `items` and `reconsider` are empty, write `[]`.
+
+## Guardrails
+
+- Do NOT modify any repo source code. Only write the four output files.
+- Do NOT create commits, branches, or PRs.
+- Do NOT call tools that post externally (Slack, GitHub comments, issues, …).
+- Do NOT re-fetch the RSS/HTML sources — that was the prior step's job.
+  `WebFetch` is only for drilling into a specific advisory/article URL to
+  resolve a `tocheck` ambiguity (budget 3).
+- If total runtime exceeds 10 minutes, finish what you have, write partial
+  outputs (+ a note in the tocheck run summary), and exit cleanly.

scripts/vuln_watch/fetch_and_diff.py

@@ -0,0 +1,570 @@
+#!/usr/bin/env python3
+"""Fetch all configured sources, dedup against state/seen.json, emit new_items.json.
+
+Writes updated per-source HTTP cache metadata (etag, last_modified, hwm_*) back
+into state/seen.json. Does NOT touch state.seen / state.aliases — that is the
+merge step's job, after Claude has classified the new items.
+
+Usage:
+    SCAN_DATE=2026-04-18T14:24:43Z python -m scripts.vuln_watch.fetch_and_diff
+"""
+from __future__ import annotations
+
+import argparse
+import datetime
+import gzip
+import json
+import os
+import pathlib
+import re
+import sys
+import urllib.error
+import urllib.parse
+import urllib.request
+from typing import Any, Iterable
+
+import feedparser  # type: ignore[import-untyped]
+
+from .sources import REQUEST_TIMEOUT, SOURCES, Source, USER_AGENT
+from . import state
+
+
+CVE_RE = re.compile(r"CVE-\d{4}-\d{4,7}")
+DEFAULT_WINDOW_HOURS = 25
+DEFAULT_RECONSIDER_AGE_DAYS = 7
+MAX_ITEMS_PER_FEED = 200
+SNIPPET_MAX = 400
+NEW_ITEMS_PATH = pathlib.Path("new_items.json")
+
+
+def parse_iso(ts: str | None) -> datetime.datetime | None:
+    if not ts:
+        return None
+    try:
+        return datetime.datetime.fromisoformat(ts.replace("Z", "+00:00"))
+    except ValueError:
+        return None
+
+
+def now_from_scan_date(scan_date: str) -> datetime.datetime:
+    dt = parse_iso(scan_date)
+    if dt is None:
+        dt = datetime.datetime.now(datetime.timezone.utc)
+    return dt
+
+
+def conditional_get(
+    url: str,
+    etag: str | None,
+    last_modified: str | None,
+    user_agent: str = USER_AGENT,
+) -> tuple[int | str, bytes | None, str | None, str | None]:
+    """Perform a conditional GET.
+
+    Returns (status, body, new_etag, new_last_modified).
+
+    status is:
+      - 200 with body on success
+      - 304 with body=None when unchanged
+      - an int HTTP error code on server-side errors
+      - a string describing a network/transport failure
+    """
+    req = urllib.request.Request(url, headers={
+        "User-Agent": user_agent,
+        # AMD's CDN stalls on non-gzip clients; asking for gzip speeds up
+        # every source and is strictly beneficial (we decompress locally).
+        "Accept-Encoding": "gzip",
+    })
+    if etag:
+        req.add_header("If-None-Match", etag)
+    if last_modified:
+        req.add_header("If-Modified-Since", last_modified)
+    try:
+        with urllib.request.urlopen(req, timeout=REQUEST_TIMEOUT) as resp:
+            body = resp.read()
+            if resp.headers.get("Content-Encoding", "").lower() == "gzip":
+                try:
+                    body = gzip.decompress(body)
+                except OSError:
+                    pass  # server lied about encoding; use as-is
+            return (
+                resp.status,
+                body,
+                resp.headers.get("ETag"),
+                resp.headers.get("Last-Modified"),
+            )
+    except urllib.error.HTTPError as e:
+        if e.code == 304:
+            return (304, None, etag, last_modified)
+        return (e.code, None, etag, last_modified)
+    except (urllib.error.URLError, TimeoutError, OSError) as e:
+        return (f"network:{type(e).__name__}", None, etag, last_modified)
+
+
+def extract_cves(text: str) -> list[str]:
+    seen: set[str] = set()
+    out: list[str] = []
+    for m in CVE_RE.findall(text or ""):
+        if m not in seen:
+            seen.add(m)
+            out.append(m)
+    return out
+
+
+def extract_vendor_ids(text: str, patterns: Iterable[str]) -> list[str]:
+    seen: set[str] = set()
+    out: list[str] = []
+    for p in patterns:
+        for m in re.findall(p, text or ""):
+            if m not in seen:
+                seen.add(m)
+                out.append(m)
+    return out
+
+
+def pick_stable_id(vendor_ids: list[str], cves: list[str], guid: str, link: str) -> str:
+    """Pick canonical-ish stable ID: vendor advisory → CVE → guid → permalink.
+
+    CVE is preferred over guid/URL so that the same CVE seen via different
+    feeds collapses on its stable_id alone (in addition to the alias map).
+    """
+    if vendor_ids:
+        return vendor_ids[0]
+    if cves:
+        return cves[0]
+    if guid:
+        return guid
+    return link
+
+
+def clean_snippet(s: str) -> str:
+    s = re.sub(r"<[^>]+>", " ", s or "")
+    s = re.sub(r"\s+", " ", s)
+    return s.strip()
+
+
+def _struct_time_to_iso(st: Any) -> str | None:
+    if not st:
+        return None
+    try:
+        return datetime.datetime(*st[:6], tzinfo=datetime.timezone.utc).isoformat()
+    except (TypeError, ValueError):
+        return None
+
+
+def parse_feed_body(src: Source, body: bytes) -> list[dict[str, Any]]:
+    parsed = feedparser.parse(body)
+    items: list[dict[str, Any]] = []
+    for entry in parsed.entries[:MAX_ITEMS_PER_FEED]:
+        link = (entry.get("link") or "").strip()
+        guid = (entry.get("id") or entry.get("guid") or "").strip()
+        title = (entry.get("title") or "").strip()
+        summary = entry.get("summary") or ""
+        published_at = (
+            _struct_time_to_iso(entry.get("published_parsed"))
+            or _struct_time_to_iso(entry.get("updated_parsed"))
+        )
+        blob = f"{title}\n{summary}"
+        cves = extract_cves(blob)
+        vendor_ids = extract_vendor_ids(blob, src.advisory_id_patterns)
+        stable_id = pick_stable_id(vendor_ids, cves, guid, link)
+        items.append({
+            "source": src.name,
+            "stable_id": stable_id,
+            "title": title,
+            "permalink": link,
+            "guid": guid,
+            "published_at": published_at,
+            "extracted_cves": cves,
+            "vendor_ids": vendor_ids,
+            "snippet": clean_snippet(summary)[:SNIPPET_MAX],
+        })
+    return items
+
+
+def _parse_intel_psirt(src: Source, text: str) -> list[dict[str, Any]]:
+    """Intel's security-center page uses a table of <tr class="data"> rows:
+
+        <tr class="data" ...>
+          <td ...><a href="/.../intel-sa-NNNNN.html">Title</a></td>
+          <td>INTEL-SA-NNNNN</td>
+          <td>March 10, 2026</td>    <- Last updated
+          <td>March 10, 2026</td>    <- First published
+        </tr>
+
+    We pick the later of the two dates as `published_at` (most recent
+    activity) so updates to older advisories also show up in the window.
+    """
+    items: list[dict[str, Any]] = []
+    seen_ids: set[str] = set()
+    permalink_base = src.display_url or src.url
+    for m in re.finditer(r'<tr class="data"[^>]*>(.*?)</tr>', text, re.DOTALL):
+        row = m.group(1)
+        sid = re.search(r'INTEL-SA-\d+', row)
+        if not sid:
+            continue
+        advisory_id = sid.group(0)
+        if advisory_id in seen_ids:
+            continue
+        seen_ids.add(advisory_id)
+        link_m = re.search(r'href="([^"#]+)"', row)
+        permalink = urllib.parse.urljoin(permalink_base, link_m.group(1)) if link_m else permalink_base
+        title_m = re.search(r'<a[^>]*>([^<]+)</a>', row)
+        title = title_m.group(1).strip() if title_m else advisory_id
+        published_at: str | None = None
+        for ds in re.findall(r'<td[^>]*>\s*([A-Z][a-z]+ \d{1,2}, \d{4})\s*</td>', row):
+            try:
+                dt = datetime.datetime.strptime(ds, "%B %d, %Y").replace(tzinfo=datetime.timezone.utc)
+                iso = dt.isoformat()
+                if published_at is None or iso > published_at:
+                    published_at = iso
+            except ValueError:
+                continue
+        items.append({
+            "source": src.name,
+            "stable_id": advisory_id,
+            "title": title,
+            "permalink": permalink,
+            "guid": "",
+            "published_at": published_at,
+            "extracted_cves": extract_cves(row),
+            "vendor_ids": [advisory_id],
+            "snippet": clean_snippet(row)[:SNIPPET_MAX],
+        })
+    return items[:MAX_ITEMS_PER_FEED]
+
+
+def _parse_amd_psirt(src: Source, text: str) -> list[dict[str, Any]]:
+    """AMD's product-security page has a bulletin table where each row ends
+    with two `<td data-sort="YYYY-MM-DD HHMMSS">` cells (Published Date,
+    Last Updated Date). The machine-readable `data-sort` attribute is far
+    easier to parse than the human-readable text alongside it.
+    """
+    items: list[dict[str, Any]] = []
+    seen_ids: set[str] = set()
+    permalink_base = src.display_url or src.url
+    for m in re.finditer(r'<tr[^>]*>(.*?AMD-SB-\d+.*?)</tr>', text, re.DOTALL):
+        row = m.group(1)
+        sid = re.search(r'AMD-SB-\d+', row)
+        if not sid:
+            continue
+        advisory_id = sid.group(0)
+        if advisory_id in seen_ids:
+            continue
+        seen_ids.add(advisory_id)
+        link_m = re.search(r'href="([^"#]+)"', row)
+        permalink = urllib.parse.urljoin(permalink_base, link_m.group(1)) if link_m else permalink_base
+        title_m = re.search(r'<a[^>]*>([^<]+)</a>', row)
+        title = title_m.group(1).strip() if title_m else advisory_id
+        published_at: str | None = None
+        for (y, mo, d, h, mi, s) in re.findall(
+            r'data-sort="(\d{4})-(\d{2})-(\d{2})\s+(\d{2})(\d{2})(\d{2})"', row
+        ):
+            iso = f"{y}-{mo}-{d}T{h}:{mi}:{s}+00:00"
+            if published_at is None or iso > published_at:
+                published_at = iso
+        items.append({
+            "source": src.name,
+            "stable_id": advisory_id,
+            "title": title,
+            "permalink": permalink,
+            "guid": "",
+            "published_at": published_at,
+            "extracted_cves": extract_cves(row),
+            "vendor_ids": [advisory_id],
+            "snippet": clean_snippet(row)[:SNIPPET_MAX],
+        })
+    return items[:MAX_ITEMS_PER_FEED]
+
+
+def _parse_html_generic(src: Source, text: str) -> list[dict[str, Any]]:
+    """Fallback regex-only extractor for HTML sources with no known table
+    layout (arm-spec, transient-fail's tree.js). Emits `published_at=None`
+    — items pass the window filter as fail-safe, but state.seen dedup
+    prevents re-emission across runs."""
+    items: list[dict[str, Any]] = []
+    seen_ids: set[str] = set()
+    permalink_base = src.display_url or src.url
+    for pat in src.advisory_id_patterns:
+        for m in re.finditer(pat, text):
+            advisory_id = m.group(0)
+            if advisory_id in seen_ids:
+                continue
+            seen_ids.add(advisory_id)
+            window = text[max(0, m.start() - 400): m.end() + 400]
+            href_match = re.search(r'href="([^"#]+)"', window)
+            if href_match:
+                permalink = urllib.parse.urljoin(permalink_base, href_match.group(1))
+            else:
+                permalink = permalink_base
+            cves_in_window = extract_cves(window)
+            is_cve = advisory_id.startswith("CVE-")
+            cves = cves_in_window if not is_cve else list({advisory_id, *cves_in_window})
+            vendor_ids = [] if is_cve else [advisory_id]
+            items.append({
+                "source": src.name,
+                "stable_id": advisory_id,
+                "title": advisory_id,
+                "permalink": permalink,
+                "guid": "",
+                "published_at": None,
+                "extracted_cves": cves,
+                "vendor_ids": vendor_ids,
+                "snippet": clean_snippet(window)[:SNIPPET_MAX],
+            })
+    return items[:MAX_ITEMS_PER_FEED]
+
+
+_HTML_PARSERS = {
+    "intel-psirt": _parse_intel_psirt,
+    "amd-psirt":   _parse_amd_psirt,
+}
+
+
+def parse_html_body(src: Source, body: bytes) -> list[dict[str, Any]]:
+    """Dispatch to a per-source HTML parser when one is registered;
+    fall back to the generic regex-over-advisory-IDs extractor."""
+    text = body.decode("utf-8", errors="replace")
+    parser = _HTML_PARSERS.get(src.name, _parse_html_generic)
+    return parser(src, text)
+
+
+def parse_body(src: Source, body: bytes) -> list[dict[str, Any]]:
+    return parse_feed_body(src, body) if src.kind in ("rss", "atom") else parse_html_body(src, body)
+
+
+def compute_cutoff(
+    scan_now: datetime.datetime,
+    last_run: str | None,
+    window_hours: float = DEFAULT_WINDOW_HOURS,
+) -> datetime.datetime:
+    base = scan_now - datetime.timedelta(hours=window_hours)
+    lr = parse_iso(last_run)
+    if lr is None:
+        return base
+    widened = scan_now - (scan_now - lr + datetime.timedelta(hours=1))
+    return min(base, widened)
+
+
+def _resolve_window_hours() -> float:
+    """Pick up WINDOW_HOURS from the environment (set by workflow_dispatch).
+    Falls back to DEFAULT_WINDOW_HOURS for cron runs or local invocations."""
+    raw = os.environ.get("WINDOW_HOURS", "").strip()
+    if not raw:
+        return float(DEFAULT_WINDOW_HOURS)
+    try:
+        v = float(raw)
+        if v <= 0:
+            raise ValueError("must be > 0")
+        return v
+    except ValueError:
+        print(f"warning: ignoring invalid WINDOW_HOURS={raw!r}, using {DEFAULT_WINDOW_HOURS}",
+              file=sys.stderr)
+        return float(DEFAULT_WINDOW_HOURS)
+
+
+def _resolve_reconsider_age_days() -> float:
+    """Pick up RECONSIDER_AGE_DAYS from the environment. Entries whose last
+    review (reconsidered_at, or first_seen if never reconsidered) is more
+    recent than this many days ago are skipped. 0 = reconsider everything
+    every run (no throttle)."""
+    raw = os.environ.get("RECONSIDER_AGE_DAYS", "").strip()
+    if not raw:
+        return float(DEFAULT_RECONSIDER_AGE_DAYS)
+    try:
+        v = float(raw)
+        if v < 0:
+            raise ValueError("must be >= 0")
+        return v
+    except ValueError:
+        print(f"warning: ignoring invalid RECONSIDER_AGE_DAYS={raw!r}, "
+              f"using {DEFAULT_RECONSIDER_AGE_DAYS}", file=sys.stderr)
+        return float(DEFAULT_RECONSIDER_AGE_DAYS)
+
+
+def backlog_to_reconsider(
+    data: dict[str, Any],
+    scan_now: datetime.datetime,
+    min_age_days: float = DEFAULT_RECONSIDER_AGE_DAYS,
+) -> list[dict[str, Any]]:
+    """Walk state.seen and emit toimplement/tocheck entries for re-review.
+
+    Throttle: skip entries whose "last review" timestamp is more recent
+    than `min_age_days` ago. "Last review" is `reconsidered_at` if Claude
+    has already reconsidered the entry at least once, otherwise
+    `first_seen` (the initial classification was itself a review). With
+    `min_age_days=0` the throttle is disabled — every qualifying entry
+    is emitted on every run.
+
+    Items in `unrelated` are never emitted — those are settled.
+    A CVE alias pointing at this canonical is included in `extracted_cves`
+    so Claude sees every known CVE for the item without having to consult
+    the full alias map.
+    """
+    seen = data.get("seen", {})
+    aliases = data.get("aliases", {})
+    by_canonical: dict[str, list[str]] = {}
+    for alt, canon in aliases.items():
+        by_canonical.setdefault(canon, []).append(alt)
+
+    # Any entry whose last review is newer than this ISO cutoff is throttled.
+    cutoff = (scan_now - datetime.timedelta(days=min_age_days)).isoformat()
+
+    out: list[dict[str, Any]] = []
+    for canonical, rec in seen.items():
+        if rec.get("bucket") not in ("toimplement", "tocheck"):
+            continue
+        last_reviewed = rec.get("reconsidered_at") or rec.get("first_seen") or ""
+        if min_age_days > 0 and last_reviewed and last_reviewed > cutoff:
+            continue
+        cves: list[str] = []
+        if canonical.startswith("CVE-"):
+            cves.append(canonical)
+        for alt in by_canonical.get(canonical, []):
+            if alt.startswith("CVE-") and alt not in cves:
+                cves.append(alt)
+        out.append({
+            "canonical_id":   canonical,
+            "current_bucket": rec.get("bucket"),
+            "title":          rec.get("title") or "",
+            "sources":        list(rec.get("sources") or []),
+            "urls":           list(rec.get("urls") or []),
+            "extracted_cves": cves,
+            "first_seen":     rec.get("first_seen"),
+            "reconsidered_at": rec.get("reconsidered_at"),
+        })
+    return out
+
+
+def candidate_ids(item: dict[str, Any]) -> list[str]:
+    """All identifiers under which this item might already be known."""
+    seen: set[str] = set()
+    out: list[str] = []
+    for cand in (
+        *(item.get("extracted_cves") or []),
+        *(item.get("vendor_ids") or []),
+        item.get("stable_id"),
+        item.get("guid"),
+        item.get("permalink"),
+    ):
+        if cand and cand not in seen:
+            seen.add(cand)
+            out.append(cand)
+    return out
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--scan-date", default=os.environ.get("SCAN_DATE", ""))
+    ap.add_argument("--output", type=pathlib.Path, default=NEW_ITEMS_PATH)
+    args = ap.parse_args()
+
+    scan_now = now_from_scan_date(args.scan_date)
+    scan_date_iso = scan_now.isoformat()
+    window_hours = _resolve_window_hours()
+    reconsider_age_days = _resolve_reconsider_age_days()
+    data = state.load()
+    cutoff = compute_cutoff(scan_now, data.get("last_run"), window_hours)
+
+    per_source: dict[str, dict[str, Any]] = {}
+    all_new: list[dict[str, Any]] = []
+
+    for src in SOURCES:
+        meta = dict(data["sources"].get(src.name, {}))
+        status, body, etag, last_modified = conditional_get(
+            src.url, meta.get("etag"), meta.get("last_modified"),
+            user_agent=src.user_agent or USER_AGENT,
+        )
+        meta["last_fetched_at"] = scan_date_iso
+        meta["last_status"] = status
+
+        if isinstance(status, str) or (isinstance(status, int) and status >= 400 and status != 304):
+            per_source[src.name] = {"status": status, "new": 0}
+            data["sources"][src.name] = meta
+            continue
+
+        if status == 304 or body is None:
+            per_source[src.name] = {"status": 304, "new": 0}
+            data["sources"][src.name] = meta
+            continue
+
+        # Refresh cache headers only on successful 200.
+        if etag:
+            meta["etag"] = etag
+        if last_modified:
+            meta["last_modified"] = last_modified
+
+        items = parse_body(src, body)
+        total = len(items)
+
+        in_window = []
+        for it in items:
+            pub = parse_iso(it.get("published_at"))
+            if pub is None or pub >= cutoff:
+                in_window.append(it)
+
+        new: list[dict[str, Any]] = []
+        hwm_pub = meta.get("hwm_published_at")
+        hwm_id = meta.get("hwm_id")
+        for it in in_window:
+            if state.lookup(data, candidate_ids(it)) is not None:
+                continue
+            new.append(it)
+            pub = it.get("published_at")
+            if pub and (not hwm_pub or pub > hwm_pub):
+                hwm_pub = pub
+                hwm_id = it.get("stable_id")
+
+        if new:
+            meta["hwm_published_at"] = hwm_pub
+            meta["hwm_id"] = hwm_id
+
+        data["sources"][src.name] = meta
+        per_source[src.name] = {"status": status, "new": len(new), "total_in_feed": total}
+        all_new.extend(new)
+
+    # Persist updated HTTP cache metadata regardless of whether Claude runs.
+    state.save(data)
+
+    reconsider = backlog_to_reconsider(data, scan_now, reconsider_age_days)
+
+    out = {
+        "scan_date": scan_date_iso,
+        "window_cutoff": cutoff.isoformat(),
+        "per_source": per_source,
+        "items": all_new,
+        "reconsider": reconsider,
+    }
+    args.output.write_text(json.dumps(out, indent=2, sort_keys=True) + "\n")
+
+    # GitHub Actions step outputs. Downstream `if:` conditions gate the
+    # classify step on `new_count || reconsider_count`; both must be 0
+    # for Claude to be skipped.
+    gh_out = os.environ.get("GITHUB_OUTPUT")
+    if gh_out:
+        with open(gh_out, "a") as f:
+            f.write(f"new_count={len(all_new)}\n")
+            f.write(f"reconsider_count={len(reconsider)}\n")
+            failures = [
+                s for s, v in per_source.items()
+                if not (isinstance(v["status"], int) and v["status"] in (200, 304))
+            ]
+            f.write(f"fetch_failures_count={len(failures)}\n")
+
+    print(f"Scan date:    {scan_date_iso}")
+    print(f"Window:       {window_hours:g} h")
+    print(f"Cutoff:       {cutoff.isoformat()}")
+    print(f"New items:    {len(all_new)}")
+    if reconsider_age_days == 0:
+        print(f"Reconsider:   {len(reconsider)} (throttle disabled)")
+    else:
+        print(f"Reconsider:   {len(reconsider)} (throttle: "
+              f"skip entries reviewed <{reconsider_age_days:g}d ago)")
+    for s, v in per_source.items():
+        print(f"  {s:14s} status={str(v['status']):>16} new={v['new']}")
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

scripts/vuln_watch/merge_state.py

@@ -0,0 +1,298 @@
+#!/usr/bin/env python3
+"""Merge Claude's classifications.json into state/seen.json.
+
+Inputs:
+    state/seen.json          (already has updated .sources from fetch_and_diff)
+    classifications.json     (written by the Claude step; list of records)
+    new_items.json           (fallback source of per-item metadata, if Claude
+                              omitted urls/sources in a record)
+
+Each classification record has shape:
+    {
+      "stable_id":      "...",           # required (the key used in new_items.json)
+      "canonical_id":   "...",           # optional; defaults to first extracted_cves, else stable_id
+      "bucket":         "toimplement|tocheck|unrelated",
+      "extracted_cves": ["...", ...],    # optional
+      "sources":        ["...", ...],    # optional
+      "urls":           ["...", ...],    # optional
+      "reconsider":     true             # optional; set by Claude for reconsidered
+                                         #   backlog entries — merge overwrites
+                                         #   the stored bucket (incl. demotions)
+                                         #   instead of promoting
+    }
+
+Behavior:
+    - For records WITHOUT `reconsider: true` (fresh items):
+      upsert seen[canonical_id], union sources/urls, promote bucket strength.
+    - For records WITH `reconsider: true` (previously-classified entries):
+      overwrite the stored bucket unconditionally (permits demotions), union
+      sources/urls. If Claude's canonical_id differs from the stable_id (the
+      previous canonical), rekey the seen entry under the new ID and leave
+      the old as an alias — used when a CVE has since been assigned to what
+      was previously a bare vendor-ID entry.
+    - For every alt_id in (stable_id, vendor_ids, extracted_cves) that differs
+      from canonical_id, set aliases[alt_id] = canonical_id.
+    - Update last_run to SCAN_DATE.
+    - Prune entries older than RETENTION_DAYS (180) before writing.
+    - Also writes the three daily watch_*.md files as stubs if Claude didn't run
+      (i.e. when new_items.json was empty and the classify step was skipped).
+"""
+from __future__ import annotations
+
+import argparse
+import datetime
+import json
+import os
+import pathlib
+import sys
+from typing import Any
+
+from . import state
+
+
+RETENTION_DAYS = 180
+NEW_ITEMS_PATH = pathlib.Path("new_items.json")
+CLASSIFICATIONS_PATH = pathlib.Path("classifications.json")
+
+
+def _load_json(path: pathlib.Path, default: Any) -> Any:
+    if not path.exists():
+        return default
+    return json.loads(path.read_text())
+
+
+def _canonical(record: dict[str, Any], fallback_meta: dict[str, Any] | None) -> str:
+    if record.get("canonical_id"):
+        return record["canonical_id"]
+    cves = record.get("extracted_cves") or (fallback_meta or {}).get("extracted_cves") or []
+    if cves:
+        return cves[0]
+    return record["stable_id"]
+
+
+def _alt_ids(record: dict[str, Any], fallback_meta: dict[str, Any] | None) -> list[str]:
+    ids: list[str] = []
+    ids.append(record.get("stable_id", ""))
+    ids.extend(record.get("extracted_cves") or [])
+    if fallback_meta:
+        ids.extend(fallback_meta.get("extracted_cves") or [])
+        ids.extend(fallback_meta.get("vendor_ids") or [])
+        guid = fallback_meta.get("guid")
+        if guid:
+            ids.append(guid)
+        link = fallback_meta.get("permalink")
+        if link:
+            ids.append(link)
+    return [i for i in ids if i]
+
+
+def _unique(seq: list[str]) -> list[str]:
+    seen: set[str] = set()
+    out: list[str] = []
+    for x in seq:
+        if x and x not in seen:
+            seen.add(x)
+            out.append(x)
+    return out
+
+
+def merge(
+    data: dict[str, Any],
+    classifications: list[dict[str, Any]],
+    new_items_by_stable_id: dict[str, dict[str, Any]],
+    scan_date: str,
+) -> None:
+    for rec in classifications:
+        if not rec.get("stable_id"):
+            continue
+        if rec.get("reconsider"):
+            _apply_reconsider(data, rec, scan_date)
+        else:
+            _apply_new_item(data, rec, new_items_by_stable_id, scan_date)
+
+
+def _apply_new_item(
+    data: dict[str, Any],
+    rec: dict[str, Any],
+    new_items_by_stable_id: dict[str, dict[str, Any]],
+    scan_date: str,
+) -> None:
+    stable_id = rec["stable_id"]
+    meta = new_items_by_stable_id.get(stable_id, {})
+    canonical = _canonical(rec, meta)
+    bucket = rec.get("bucket", "unrelated")
+    title = (meta.get("title") or "").strip()
+
+    existing = data["seen"].get(canonical)
+    if existing is None:
+        data["seen"][canonical] = {
+            "bucket": bucket,
+            "first_seen": scan_date,
+            "seen_at": scan_date,
+            "title": title,
+            "sources": _unique(list(rec.get("sources") or []) + ([meta.get("source")] if meta.get("source") else [])),
+            "urls":    _unique(list(rec.get("urls") or []) + ([meta.get("permalink")] if meta.get("permalink") else [])),
+        }
+    else:
+        existing["bucket"] = state.promote_bucket(existing["bucket"], bucket)
+        existing["seen_at"] = scan_date
+        existing.setdefault("first_seen", existing.get("seen_at") or scan_date)
+        if not existing.get("title") and title:
+            existing["title"] = title
+        existing["sources"] = _unique(list(existing.get("sources") or []) + list(rec.get("sources") or []) + ([meta.get("source")] if meta.get("source") else []))
+        existing["urls"] = _unique(list(existing.get("urls") or []) + list(rec.get("urls") or []) + ([meta.get("permalink")] if meta.get("permalink") else []))
+
+    for alt in _alt_ids(rec, meta):
+        if alt != canonical:
+            data["aliases"][alt] = canonical
+
+
+def _apply_reconsider(
+    data: dict[str, Any],
+    rec: dict[str, Any],
+    scan_date: str,
+) -> None:
+    """Re-review of a previously-classified entry. The record's stable_id
+    is the entry's current canonical key in state; `canonical_id` may name
+    a new key (e.g. a freshly-assigned CVE) — in which case we rekey."""
+    old_key = rec["stable_id"]
+    new_canonical = _canonical(rec, None)
+    bucket = rec.get("bucket", "unrelated")
+
+    # Resolve the current record — may need to follow an alias if the
+    # backlog snapshot the classifier reviewed is slightly out of sync.
+    current_key = old_key if old_key in data["seen"] else data["aliases"].get(old_key)
+    if not current_key or current_key not in data["seen"]:
+        print(f"warning: reconsider record for {old_key!r} points at no "
+              f"state entry; skipping.", file=sys.stderr)
+        return
+
+    existing = data["seen"][current_key]
+
+    # Overwrite bucket unconditionally (allows demotions) and stamp the
+    # reconsideration date so we can later throttle if this grows.
+    existing["bucket"] = bucket
+    existing["seen_at"] = scan_date
+    existing["reconsidered_at"] = scan_date
+
+    # Union any fresh sources/urls the classifier surfaced.
+    if rec.get("sources"):
+        existing["sources"] = _unique(list(existing.get("sources") or []) + list(rec["sources"]))
+    if rec.get("urls"):
+        existing["urls"] = _unique(list(existing.get("urls") or []) + list(rec["urls"]))
+
+    # Alias every alt ID the classifier provided to the current key
+    # (before a possible rekey below redirects them).
+    for alt in _alt_ids(rec, None):
+        if alt != current_key:
+            data["aliases"][alt] = current_key
+
+    # Rekey if Claude newly identified a canonical ID (e.g., a CVE for a
+    # vendor-ID entry). If the destination already exists, merge; else
+    # move. In both cases, retarget all aliases and leave the old key
+    # itself as an alias.
+    if new_canonical and new_canonical != current_key:
+        if new_canonical in data["seen"]:
+            dest = data["seen"][new_canonical]
+            dest["bucket"] = state.promote_bucket(dest.get("bucket", "unrelated"), existing.get("bucket", "unrelated"))
+            dest["sources"] = _unique(list(dest.get("sources") or []) + list(existing.get("sources") or []))
+            dest["urls"] = _unique(list(dest.get("urls") or []) + list(existing.get("urls") or []))
+            if not dest.get("title") and existing.get("title"):
+                dest["title"] = existing["title"]
+            dest["seen_at"] = scan_date
+            dest["reconsidered_at"] = scan_date
+            dest.setdefault("first_seen", existing.get("first_seen") or scan_date)
+            del data["seen"][current_key]
+        else:
+            data["seen"][new_canonical] = existing
+            del data["seen"][current_key]
+
+        for alias_key, target in list(data["aliases"].items()):
+            if target == current_key:
+                data["aliases"][alias_key] = new_canonical
+        data["aliases"][current_key] = new_canonical
+        # Clean up any self-aliases the retarget may have produced.
+        for k in [k for k, v in data["aliases"].items() if k == v]:
+            del data["aliases"][k]
+
+
+def ensure_stub_reports(scan_date: str) -> None:
+    """If the Claude step was skipped, write empty stub watch_*.md files so the
+    report artifact is consistent across runs."""
+    day = scan_date[:10]  # YYYY-MM-DD
+    stub = "(no new items in this window)\n"
+    for bucket in ("toimplement", "tocheck", "unrelated"):
+        p = pathlib.Path(f"watch_{day}_{bucket}.md")
+        if not p.exists():
+            p.write_text(stub)
+
+
+def write_snapshots(data: dict[str, Any], scan_date: str) -> None:
+    """Write current_toimplement.md and current_tocheck.md — full backlog
+    snapshots reflecting every entry in state under those buckets. A human
+    who reads only the latest run's artifact sees the complete picture
+    without having to consult prior runs."""
+    for bucket in ("toimplement", "tocheck"):
+        entries = [
+            (cid, rec) for cid, rec in data["seen"].items()
+            if rec.get("bucket") == bucket
+        ]
+        # Oldest first — long-lingering items stay at the top as a reminder.
+        entries.sort(key=lambda kv: kv[1].get("first_seen") or kv[1].get("seen_at") or "")
+        out = [
+            f"# Current `{bucket}` backlog",
+            "",
+            f"_Snapshot as of {scan_date}. "
+            f"{len(entries)} item(s). Oldest first._",
+            "",
+        ]
+        if not entries:
+            out.append("(backlog is empty)")
+        else:
+            for cid, rec in entries:
+                title = rec.get("title") or ""
+                first_seen = (rec.get("first_seen") or rec.get("seen_at") or "")[:10]
+                sources = ", ".join(rec.get("sources") or []) or "(none)"
+                out.append(f"- **{cid}**" + (f" — {title}" if title else ""))
+                out.append(f"  first seen {first_seen} · sources: {sources}")
+                for u in rec.get("urls") or []:
+                    out.append(f"  - {u}")
+                out.append("")
+        pathlib.Path(f"current_{bucket}.md").write_text("\n".join(out))
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--scan-date", default=os.environ.get("SCAN_DATE", ""))
+    ap.add_argument("--classifications", type=pathlib.Path, default=CLASSIFICATIONS_PATH)
+    ap.add_argument("--new-items", type=pathlib.Path, default=NEW_ITEMS_PATH)
+    args = ap.parse_args()
+
+    scan_date = args.scan_date or datetime.datetime.now(datetime.timezone.utc).isoformat()
+
+    data = state.load()
+    classifications = _load_json(args.classifications, [])
+    new_items_doc = _load_json(args.new_items, {"items": []})
+    new_items_by_stable_id = {it["stable_id"]: it for it in new_items_doc.get("items", []) if it.get("stable_id")}
+
+    if not isinstance(classifications, list):
+        print(f"warning: {args.classifications} is not a list; ignoring", file=sys.stderr)
+        classifications = []
+
+    merge(data, classifications, new_items_by_stable_id, scan_date)
+    data["last_run"] = scan_date
+
+    scan_now = datetime.datetime.fromisoformat(scan_date.replace("Z", "+00:00"))
+    before, after = state.prune(data, RETENTION_DAYS, scan_now)
+    state.save(data)
+    ensure_stub_reports(scan_date)
+    write_snapshots(data, scan_date)
+
+    print(f"Merged {len(classifications)} classifications.")
+    print(f"Pruned seen: {before} -> {after} entries (retention={RETENTION_DAYS}d).")
+    print(f"Aliases: {len(data['aliases'])}.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

scripts/vuln_watch/sources.py

@@ -0,0 +1,59 @@
+"""Declarative list of sources polled by the daily vuln scan."""
+from dataclasses import dataclass
+from typing import Literal
+
+Kind = Literal["rss", "atom", "html"]
+
+
+@dataclass(frozen=True)
+class Source:
+    name: str
+    url: str
+    kind: Kind
+    # For HTML sources: regexes used to extract advisory IDs from the page.
+    advisory_id_patterns: tuple[str, ...] = ()
+    # Human-facing URL to use as permalink fallback when `url` points at a
+    # non-browsable endpoint (e.g. a JS data file). Empty = use `url`.
+    display_url: str = ""
+    # Per-source UA override. AMD's CDN drops connections when the UA string
+    # contains a parenthesized URL, while Intel/ARM's WAF rejects UAs that
+    # don't identify themselves — so we can't use one UA everywhere.
+    # Empty = use the module-level USER_AGENT.
+    user_agent: str = ""
+
+
+SOURCES: tuple[Source, ...] = (
+    Source("phoronix",       "https://www.phoronix.com/rss.php", "rss"),
+    Source("oss-sec",        "https://seclists.org/rss/oss-sec.rss", "rss"),
+    Source("lwn",            "https://lwn.net/headlines/newrss", "rss"),
+    Source("project-zero",   "https://googleprojectzero.blogspot.com/feeds/posts/default", "atom"),
+    Source("vusec",          "https://www.vusec.net/feed/", "rss"),
+    Source("comsec-eth",     "https://comsec.ethz.ch/category/news/feed/", "rss"),
+    # api.msrc.microsoft.com/update-guide/rss is the real RSS endpoint; the
+    # msrc.microsoft.com/... URL returns the SPA shell (2.7 KB) instead.
+    Source("msrc",           "https://api.msrc.microsoft.com/update-guide/rss", "rss"),
+    Source("cisa",           "https://www.cisa.gov/cybersecurity-advisories/all.xml", "rss"),
+    Source("cert-cc",        "https://www.kb.cert.org/vuls/atomfeed/", "atom"),
+    Source("intel-psirt",    "https://www.intel.com/content/www/us/en/security-center/default.html", "html",
+           (r"INTEL-SA-\d+",)),
+    Source("amd-psirt",      "https://www.amd.com/en/resources/product-security.html", "html",
+           (r"AMD-SB-\d+",),
+           user_agent="spectre-meltdown-checker/vuln-watch"),
+    Source("arm-spec",       "https://developer.arm.com/Arm%20Security%20Center/Speculative%20Processor%20Vulnerability", "html",
+           (r"CVE-\d{4}-\d{4,7}",)),
+    # transient.fail renders its attack table from tree.js client-side; we
+    # pull the JS file directly (CVE regex works on its JSON-ish body).
+    Source("transient-fail", "https://transient.fail/tree.js", "html",
+           (r"CVE-\d{4}-\d{4,7}",),
+           display_url="https://transient.fail/"),
+)
+
+# Identify ourselves honestly. Akamai/Cloudflare WAFs fronting intel.com,
+# developer.arm.com, and cisa.gov return 403 when the UA claims "Mozilla"
+# but TLS/HTTP fingerprint doesn't match a real browser — an honest bot UA
+# passes those rules cleanly.
+USER_AGENT = (
+    "spectre-meltdown-checker/vuln-watch "
+    "(+https://github.com/speed47/spectre-meltdown-checker)"
+)
+REQUEST_TIMEOUT = 30

scripts/vuln_watch/state.py

@@ -0,0 +1,137 @@
+"""Load/save/migrate/lookup helpers for state/seen.json.
+
+Schema v2:
+    {
+      "schema_version": 2,
+      "last_run": "<iso8601>|null",
+      "sources": {
+        "<name>": {
+          "etag": "...",
+          "last_modified": "...",
+          "hwm_id": "...",
+          "hwm_published_at": "<iso8601>",
+          "last_fetched_at": "<iso8601>",
+          "last_status": 200|304|<http-err>|"<str-err>"
+        }
+      },
+      "seen": {
+        "<canonical_id>": {
+          "bucket": "toimplement|tocheck|unrelated",
+          "seen_at": "<iso8601>",
+          "sources": ["<source-name>", ...],
+          "urls":    ["<permalink>", ...]
+        }
+      },
+      "aliases": { "<alt_id>": "<canonical_id>" }
+    }
+"""
+from __future__ import annotations
+
+import datetime
+import json
+import pathlib
+from typing import Any
+
+
+STATE_PATH = pathlib.Path("state/seen.json")
+SCHEMA_VERSION = 2
+
+
+def empty() -> dict[str, Any]:
+    return {
+        "schema_version": SCHEMA_VERSION,
+        "last_run": None,
+        "sources": {},
+        "seen": {},
+        "aliases": {},
+    }
+
+
+def load(path: pathlib.Path = STATE_PATH) -> dict[str, Any]:
+    if not path.exists():
+        # Fallback: a committed bootstrap seed, used to bridge a workflow
+        # rename (old workflow_id's artifacts are invisible to the new one).
+        # Remove the bootstrap file once one successful run has produced a
+        # normal artifact, otherwise it will shadow any future first-run.
+        bootstrap = path.parent / f"{path.name}.bootstrap"
+        if bootstrap.exists():
+            print(f"state: seeding from {bootstrap} (no prior-run artifact found)")
+            path = bootstrap
+    if not path.exists():
+        return empty()
+    data = json.loads(path.read_text())
+    return _migrate(data)
+
+
+def save(data: dict[str, Any], path: pathlib.Path = STATE_PATH) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(data, indent=2, sort_keys=True) + "\n")
+
+
+def _migrate(data: dict[str, Any]) -> dict[str, Any]:
+    """Bring any older schema up to SCHEMA_VERSION."""
+    version = data.get("schema_version")
+    if version == SCHEMA_VERSION:
+        data.setdefault("sources", {})
+        data.setdefault("aliases", {})
+        data.setdefault("seen", {})
+        return data
+
+    # v1 shape: {"last_run": ..., "seen": {<id>: {bucket, seen_at, source, cve?}}}
+    migrated_seen: dict[str, Any] = {}
+    aliases: dict[str, str] = {}
+    for key, entry in (data.get("seen") or {}).items():
+        rec = {
+            "bucket":  entry.get("bucket", "unrelated"),
+            "seen_at": entry.get("seen_at"),
+            "sources": [entry["source"]] if entry.get("source") else [],
+            "urls":    [key] if isinstance(key, str) and key.startswith("http") else [],
+        }
+        migrated_seen[key] = rec
+        # If a v1 entry had a CVE that differs from the key, alias the CVE -> key.
+        cve = entry.get("cve")
+        if cve and cve != key:
+            aliases[cve] = key
+
+    return {
+        "schema_version": SCHEMA_VERSION,
+        "last_run": data.get("last_run"),
+        "sources": {},
+        "seen": migrated_seen,
+        "aliases": aliases,
+    }
+
+
+def lookup(data: dict[str, Any], candidate_ids: list[str]) -> str | None:
+    """Return the canonical key if any candidate is already known, else None."""
+    seen = data["seen"]
+    aliases = data["aliases"]
+    for cid in candidate_ids:
+        if not cid:
+            continue
+        if cid in seen:
+            return cid
+        canonical = aliases.get(cid)
+        if canonical and canonical in seen:
+            return canonical
+    return None
+
+
+_BUCKET_STRENGTH = {"unrelated": 0, "tocheck": 1, "toimplement": 2}
+
+
+def promote_bucket(current: str, incoming: str) -> str:
+    """Return whichever of two buckets represents the 'stronger' classification."""
+    return incoming if _BUCKET_STRENGTH.get(incoming, 0) > _BUCKET_STRENGTH.get(current, 0) else current
+
+
+def prune(data: dict[str, Any], days: int, now: datetime.datetime) -> tuple[int, int]:
+    """Drop seen entries older than `days`, and aliases pointing at dropped keys."""
+    cutoff = (now - datetime.timedelta(days=days)).isoformat()
+    before = len(data["seen"])
+    data["seen"] = {
+        k: v for k, v in data["seen"].items()
+        if (v.get("seen_at") or "9999") >= cutoff
+    }
+    data["aliases"] = {k: v for k, v in data["aliases"].items() if v in data["seen"]}
+    return before, len(data["seen"])

state/seen.json.bootstrap

@@ -0,0 +1,824 @@
+{
+  "aliases": {
+    "CVE-2018-3615": "CVE-2018-3646",
+    "CVE-2018-3620": "CVE-2018-3646",
+    "CVE-2025-54505": "https://www.phoronix.com/news/AMD-FP-DSS-Zen-1-Bug",
+    "CVE-2026-33691": "https://seclists.org/oss-sec/2026/q2/175",
+    "CVE-2026-41113": "https://seclists.org/oss-sec/2026/q2/176",
+    "CVE-2026-4519": "CVE-2026-4786",
+    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33055": "CVE-2026-33055",
+    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33056": "CVE-2026-33056",
+    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4786": "CVE-2026-4786",
+    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5160": "CVE-2026-5160",
+    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6100": "CVE-2026-6100",
+    "https://seclists.org/oss-sec/2026/q2/173": "CVE-2026-33691",
+    "https://seclists.org/oss-sec/2026/q2/176": "CVE-2026-41113",
+    "https://transient.fail/": "CVE-2019-11091"
+  },
+  "last_run": "2026-04-19T14:06:07.928573+00:00",
+  "schema_version": 2,
+  "seen": {
+    "AMD-SB-7050": {
+      "bucket": "tocheck",
+      "first_seen": "2026-04-18T14:24:43Z",
+      "seen_at": "2026-04-18T14:24:43Z",
+      "sources": [
+        "amd-psirt"
+      ],
+      "title": "",
+      "urls": []
+    },
+    "AMD-SB-7053": {
+      "bucket": "toimplement",
+      "first_seen": "2026-04-18T14:24:43Z",
+      "seen_at": "2026-04-18T14:24:43Z",
+      "sources": [
+        "amd-psirt"
+      ],
+      "title": "",
+      "urls": []
+    },
+    "CVE-2017-5715": {
+      "bucket": "unrelated",
+      "first_seen": "2026-04-19T14:06:07.928573+00:00",
+      "seen_at": "2026-04-19T14:06:07.928573+00:00",
+      "sources": [
+        "transient-fail"
+      ],
+      "title": "CVE-2017-5715",
+      "urls": [
+        "https://transient.fail/"
+      ]
+    },
+    "CVE-2017-5753": {
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+      "title": "CVE-2017-5753",
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+      "title": "CVE-2026-33055 tar-rs incorrectly ignores PAX size headers if header size is nonzero",
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+      "title": "CVE-2026-33056 tar-rs: unpack_in can chmod arbitrary directories by following symlinks",
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+      "title": "Re: [CVE-2026-33691] OWASP CRS whitespace padding bypass vulnerability",
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