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CVE-2026-9496
high
CVSS 7.5
Vulnerability in pacote (CVE-2026-9496)
Summary
vulnerability in pacote (CVE-2026-9496). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `21.5.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-9496** has been found in pacote.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade pacote to **21.5.1** or later.
If unsure, ask your IT team or search "pacote CVE-2026-9496" on the vendor's site.
CVE-2026-9496 (pacote) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `21.5.1` — 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-400) exists in pacote.
📍 Affected scope
pacote — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **21.5.1**.
🛡️ 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 'pacote' .` 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 'pacote' . | 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 `pacote` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade pacote to 21.5.1ステージング環境で 21.5.1 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。
-
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
pacote
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.5.1"}]}]
References
- web https://nvd.nist.gov/vuln/detail/CVE-2026-9496
- web https://github.com/npm/pacote/blob/9d7459440826ab4cf962ef98d8f3fd0c4d464b5c/lib/util/add-git-sha.js%23L2C1-L13C2
- web https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-16874025
- web https://security.snyk.io/vuln/SNYK-JS-PACOTE-8225084
- web https://github.com/advisories/GHSA-w4pp-8pjf-rmxw
- web https://github.com/npm/pacote/commit/ce804fb1647fe1699b2f87efd01ea9f4efed8508
- web https://github.com/npm/pacote/commit/627a7dc1a214d857472a13b48e42559c75288c9e
- web https://github.com/npm/pacote/releases/tag/v21.5.1
- web https://github.com/npm/pacote/releases/tag/v22.0.0