CVE Source Check

Audits CVE/vulnerability source coverage for a technology stack. Given an inventory of components and (optionally) the feeds you currently monitor, it maps each component to authoritative CVE sources, flags gaps, and emits audit-ready reports.

Scope

Inputs

JSON inventory format only. YAML is not supported — stdlib does not ship a YAML parser.

Outputs

Workflow

Phase 1: LOAD

1. Locate the registry: tech-source-registry.json next to this SKILL.md by default.
2. Build an inventory:

• From --inventory: parse JSON; accept either a list or {components: [...]}.
• From --inline: split on commas, parse name@version pairs.

1. If --current-sources is provided, read URLs (one per line); normalize for

case-insensitive comparison.

Gate: at least one inventory component is present. Empty inventory → exit 3.

Phase 2: MAP & VERIFY

1. For each component, look up name (and aliases) in the registry.

• Found → status mapped, attach the registry's source list.
• Missing → status unmapped, sources [].

1. If current sources were loaded, mark each source monitored: true when its

normalized URL appears in the set.

1. If --check-urls is set, HEAD-check every unique source URL. Treat

200/301/302/403/405 as reachable; record definite failures and network errors distinctly. See references/source-verification.md.

Gate: every component has a status; every source has monitored and reachable fields populated (reachable: null when checks are skipped).

Phase 3: REPORT

1. Compute the summary: components, mapped/unmapped, monitored, coverage %,

gaps, unreachable.

1. Write the JSON report.
2. Write the Markdown report:

• Summary table.
• Components table with ✅ / ⚠️ / ❌ markers.
• Gaps section listing primary then secondary sources to add (only when

gaps exist).

• Unmapped section listing registry-extension TODOs (only when unmapped

components exist).

1. Print a one-screen summary to stdout including report paths.
2. Set the exit code per the table above.

Gate: both files exist on disk and the summary printed; exit code reflects the audit result.

Quick start

# Inline, offline, no monitoring data
python3 scripts/check-cve-sources.py \
  --inline "[email protected],[email protected],postgres@16,redis@7,[email protected]" \
  --service my-service

# Inventory file + current monitored feeds
python3 scripts/check-cve-sources.py \
  --inventory examples/inventory.example.json \
  --current-sources examples/current-sources.example.txt \
  --service my-service

# Same, with link verification
python3 scripts/check-cve-sources.py \
  --inventory examples/inventory.example.json \
  --current-sources examples/current-sources.example.txt \
  --service my-service \
  --check-urls

Extending the registry

To add a technology, edit tech-source-registry.json. Each entry needs name, aliases, type, and 1–3 sources. Schema lives at references/registry-schema.md.

Reference files

• references/registry-schema.md — registry shape, allowed kind/priority,

and how to add entries.

• references/source-verification.md — HEAD-check semantics and graceful

degradation rules.

• references/output-formats.md — JSON schema, Markdown sections, and exit-code

table.

Error handling

"ERROR: failed to load registry"

Cause: registry file missing or malformed JSON. Solution: confirm tech-source-registry.json is at --registry (or default location) and parses with python3 -m json.tool.

"ERROR: failed to load inventory"

Cause: inventory file missing, malformed JSON, or unexpected shape. Solution: validate with python3 -m json.tool. Inventory must be a list or an object with a components key.

"ERROR: inventory is empty"

Cause: no usable components after parsing. Solution: confirm each entry has a name. Inline form requires non-empty tokens.

Coverage stuck at 0%

Cause: --current-sources URLs do not match registry URLs exactly (e.g., extra path segments, trailing slashes). Solution: copy URLs directly from the registry. The script normalizes scheme/host case and trailing slash; everything else must match.

--check-urls flags many [—] entries

Cause: network issues (proxy, DNS, offline) — recorded as reachable: null. Solution: re-run without --check-urls for the audit; investigate network separately. Network errors do not affect the gap exit code.