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CVE-2026-13311 high CVSS 7.5

Vulnerability in shell-quote (CVE-2026-13311)

Summary

vulnerability in shell-quote (CVE-2026-13311). Risk of unauthorized operations or information disclosure. Exploitable via `GET /ping`. Mitigation: upgrade to `1.9.0` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-13311** has been found in shell-quote. Attackers can target a specific entry point like `GET /ping` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: upgrade shell-quote to **1.9.0** or later. If unsure, ask your IT team or search "shell-quote CVE-2026-13311" on the vendor's site.
CVE-2026-13311 (shell-quote) — CWE-407 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: GET /ping / `reduce` / `Array.prototype.concat` / `parse.js` Patched: `1.9.0` — 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-407) exists in shell-quote. Attackers reach the vulnerable code path via `GET /ping` without authentication.
📍 Affected scope
shell-quote — . Attack surface: GET /ping / `reduce` / `Array.prototype.concat` / `parse.js`.
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.9.0**.
🛡️ 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 `GET /ping` requests with malformed payloads or SQL meta-characters. Run `grep -r 'shell-quote' .` 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

  1. 1
    Identify exposure identify 
    grep -r 'shell-quote' . | 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 `shell-quote` を grep し、稼働しているサービス・バージョンを把握する。

  2. 3
    Hunt for indicators of compromise detect 
    grep 'GET /ping' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで `GET /ping` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 6
    Apply patch patch 
    Upgrade shell-quote to 1.9.0

    ステージング環境で 1.9.0 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。

  4. 7
    Post-deployment verification verify 
    Replay attack against GET /ping on staging to confirm patch closes the vector

    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 shell-quote
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.0"}]}]

References

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