everything-claude-code/docs/security/supply-chain-incident-response.md

Supply-Chain Incident Response

This playbook is the ECC operator runbook for npm, GitHub Actions, and cross-ecosystem package-registry incidents. It is intentionally conservative: registry signatures, provenance, and trusted publishing are useful signals, but they do not prove that the workflow executed the intended code path.

Current External Trigger

As of 2026-05-13, the active incident class is the May 2026 TanStack npm supply-chain compromise:

• TanStack reported 84 malicious versions across 42 @tanstack/* packages, published on 2026-05-11 between 19:20 and 19:26 UTC.
• GitHub advisory GHSA-g7cv-rxg3-hmpx / CVE-2026-45321 describes install-time malware that harvests cloud credentials, GitHub tokens, npm credentials, Vault tokens, Kubernetes tokens, and SSH private keys.
• The attack chain combined pull_request_target, GitHub Actions cache poisoning across a fork/base trust boundary, and OIDC token extraction from a GitHub Actions runner.
• npm trusted publishing/provenance can confirm a package came from a bound CI identity. It cannot by itself prove that the CI cache, lifecycle scripts, or publish path were safe.

Primary references:

• https://tanstack.com/blog/npm-supply-chain-compromise-postmortem
• https://github.com/advisories/GHSA-g7cv-rxg3-hmpx
• https://tanstack.com/blog/incident-followup
• https://docs.npmjs.com/trusted-publishers/
• https://www.cisa.gov/news-events/alerts/2025/09/23/widespread-supply-chain-compromise-impacting-npm-ecosystem

ECC Exposure Check

Run this before a release candidate, after a broad dependency bump, and after any package-registry incident.

rg -n '(@tanstack|mistralai|uipath|opensearch|guardrails|axios)' \
  package.json package-lock.json .opencode/package.json .opencode/package-lock.json
npm ci --ignore-scripts
npm audit signatures
npm audit --audit-level=high
node scripts/ci/validate-workflow-security.js
node tests/scripts/npm-publish-surface.test.js
node tests/run-all.js

If a search hit appears only in documentation examples, note it in the release evidence but do not rotate credentials for a docs-only reference.

Immediate Response

If ECC or a maintainer machine installed a known-bad package version:

1. Stop the host from publishing or deploying.
2. Preserve evidence before cleanup:
   • package manager command history;
   • package-lock.json, pnpm-lock.yaml, or yarn.lock;
   • CI run URLs and runner logs;
   • npm package versions and tarball integrity hashes;
   • outbound network logs where available.
3. Treat the install host as compromised if lifecycle scripts may have run.
4. Rotate every credential reachable by the process:
   • npm automation tokens and maintainer tokens;
   • GitHub PATs, fine-grained tokens, deploy keys, and Actions secrets;
   • cloud credentials, Vault tokens, Kubernetes service-account tokens, SSH keys, and local .npmrc tokens;
   • any MCP, plugin, or harness credentials available in environment variables or user-scope config.
5. Purge GitHub Actions caches for affected repositories.
6. Reinstall from a clean environment with npm ci --ignore-scripts first.
7. Re-enable lifecycle scripts only after the dependency tree and package versions are pinned to known-clean releases.

GitHub Actions Rules

ECC enforces these rules through scripts/ci/validate-workflow-security.js:

• privileged workflows must not checkout untrusted PR refs;
• workflows with write permissions must use npm ci --ignore-scripts;
• workflows with id-token: write must not restore or save shared dependency caches;
• workflows that run npm audit must also run npm audit signatures;
• pull_request_target workflows must not restore or save shared dependency caches.

Treat any violation as a release blocker.

Publication Rules

Before tagging or publishing ECC:

1. Verify there is no unexpected dependency on packages in the active advisory.
2. Use a clean checkout or throwaway worktree for release commands.
3. Do not mix PR/test caches with publish jobs.
4. Keep id-token: write limited to release workflows that do not use shared dependency caches.
5. Prefer trusted publishing/provenance where supported, while still requiring local package-surface tests and registry-signature verification.
6. Confirm npm dist-tag, GitHub release, Claude plugin, Codex plugin, and OpenCode package state in the publication-readiness evidence document.

When To Escalate

Escalate to a maintainer security review before any release or merge if:

• a dependency lockfile references a package named in an active advisory;
• a workflow combines pull_request_target with dependency installation, cache restore/save, PR-head checkout, or write permissions;
• a release workflow combines id-token: write with shared cache usage;
• a publish workflow uses a long-lived npm token without a documented reason;
• AgentShield, GitGuardian, Dependabot, npm audit, or registry-signature checks disagree.