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CVE-2026-55487
high
CVSS 7.5
Vulnerability in pnpm (CVE-2026-55487)
Summary
vulnerability in pnpm (CVE-2026-55487). Successful exploitation can lead to full system takeover. Exploitable via ``bf1b731ee6``. Mitigation: upgrade to `10.34.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-55487** has been found in pnpm.
Attackers can target a specific entry point like ``bf1b731ee6`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.5/10.
What to do: upgrade pnpm to **10.34.2** or later.
If unsure, ask your IT team or search "pnpm CVE-2026-55487" on the vendor's site.
CVE-2026-55487 (pnpm) — CWE-346 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: `bf1b731ee6` / `allowBuilds` / `pnpm`
Patched: `10.34.2` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-346) exists in pnpm. Attackers reach the vulnerable code path via ``bf1b731ee6`` without authentication.
📍 Affected scope
pnpm — . Attack surface: `bf1b731ee6` / `allowBuilds` / `pnpm`.
🔥 Severity
Severity: High (CVSS 7.5/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **10.34.2**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'pnpm' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'pnpm' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `pnpm` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade pnpm to 10.34.2ステージング環境で 10.34.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
npm
pnpm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.5.3"}]}]
References
- exploit 134c704f-9b21-4f2e-91b3-4a467353bcc0
- web https://nvd.nist.gov/vuln/detail/CVE-2026-55487
- web https://github.com/pnpm/pnpm/commit/bf1b731ee6c0ea98709e671ff0f46bf654480ab8
- web https://github.com/pnpm/pnpm/releases/tag/v10.34.2
- web https://github.com/pnpm/pnpm/releases/tag/v11.5.3
- web https://github.com/advisories/GHSA-5wx6-mg75-v57r