feat: dependency scan reusable workflow — osv-scanner (#5)#54
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Application-source dependency vulnerability scan, first sub-issue of #8. - .github/actions/osv-scanner: composite that installs a pinned, checksum-verified osv-scanner v2.4.0 binary and scans all lockfiles against the OSV database (language-agnostic). Produces SARIF (optionally uploaded to the Security tab) and emits job-level annotations per affected package. Gates on fail-on-severity by mapping it to a CVSS threshold (critical>=9.0, high>=7.0, medium>=4.0, low>=0.1) parsed from groups[].max_severity. - .github/workflows/dep-scan-app.yml: reusable gate; inputs directory, fail-on-severity, sarif-upload, actions-ref. Immutable self-reference pattern; no harden-runner; inherits caller permissions. - ci.yml: osv-scanner dogfood (smoke test — no lockfiles in this repo). - README + approved-actions: usage, CVSS threshold mapping, osv.dev egress note. osv-scanner has no native fail-on-severity flag (nor does the official reusable workflow — only fail-on-vuln), so the gate is implemented by parsing the JSON report's max_severity. Kept the checksum-verified binary pattern (consistent with gitleaks/trufflehog/tflint/kubeconform; no new org-allowlist publisher). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes #5. Application-source dependency vulnerability scan — first sub-issue of parent #8. Establishes the
dep-scan-*.ymlpattern that #6 (checkov) and #7 (trivy) will follow.What
.github/actions/osv-scanner/action.yml.github/workflows/dep-scan-app.ymldirectory,fail-on-severity,sarif-upload,actions-ref..github/workflows/ci.ymlREADME.md,docs/approved-actions.mdAcceptance criteria (#5)
dep-scan-app.yml: osv-scanner onpull_request; scans all lockfiles; PR annotations; blocks on Critical; SARIF to Security tabfail-on-severityinput (defaultcritical)Design notes
fail-on-severityis custom — osv-scanner has no native severity gate (nor does the official reusable workflow, which only hasfail-on-vuln). Implemented by parsinggroups[].max_severity(numeric CVSS) and mapping: critical ≥ 9.0, high ≥ 7.0, medium ≥ 4.0, low ≥ 0.1.harden-runner, inherits caller permissions (security-events: writeonly whensarif-upload), immutableactions-refpattern.sarif-upload: falsefor private repos without a Code Security license (annotations + log still work).Verified locally
Checksum verify; scan of a known-vulnerable
requests==2.19.0lockfile → max CVSS 8.9; gate correctly passes atcritical(9.0), blocks athigh/medium; per-package annotations with CVE IDs.🤖 Generated with Claude Code