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CVE-2026-14257 high CVSS 7.5

Vulnerability in brace-expansion (CVE-2026-14257)

Summary

vulnerability in brace-expansion (CVE-2026-14257). Risk of unauthorized operations or information disclosure. Exploitable via ``max``. Mitigation: upgrade to `1.1.17` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-14257** has been found in brace-expansion. Attackers can target a specific entry point like ``max`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: upgrade brace-expansion to **1.1.17** or later. If unsure, ask your IT team or search "brace-expansion CVE-2026-14257" on the vendor's site.
CVE-2026-14257 (brace-expansion) — CWE-400 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `max` / `expand_` / `minimatch` / `glob` Patched: `1.1.17` — 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 brace-expansion. Attackers reach the vulnerable code path via ``max`` without authentication.
📍 Affected scope
brace-expansion — . Attack surface: `max` / `expand_` / `minimatch` / `glob`.
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.1.17**.
🛡️ 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 'brace-expansion' .` 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 'brace-expansion' . | 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 `brace-expansion` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade brace-expansion to 1.1.17

    ステージング環境で 1.1.17 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。

  3. 7
    Post-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 brace-expansion
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.17"}]}]

References

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