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CVE-2026-45149
medium
CVSS 6.5
Vulnerability in brace-expansion (CVE-2026-45149)
Summary
vulnerability in brace-expansion (CVE-2026-45149). Risk of unauthorized operations or information disclosure. Exploitable via ``max``. Mitigation: upgrade to `5.0.6` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45149** 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: 6.5/10.
What to do: upgrade brace-expansion to **5.0.6** or later.
If unsure, ask your IT team or search "brace-expansion CVE-2026-45149" on the vendor's site.
CVE-2026-45149 (brace-expansion) — CWE-400 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: `max`
Patched: `5.0.6` — apply immediately
Workaround: Ensure the string to be expanded doesn't contain more values than the desired `max` item count.
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`.
🔥 Severity
Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.0.6**.
🛡️ Workaround
Workaround: Ensure the string to be expanded doesn't contain more values than the desired `max` item count.
🔍 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
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1Identify 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。
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5Apply temporary workaround mitigate
Ensure the string to be expanded doesn't contain more values than the desired `max` item count.パッチが適用されるまでの応急処置として、Ensure the string to be expanded doesn't contain more values than the desired `max` item count. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade brace-expansion to 5.0.6ステージング環境で 5.0.6 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
brace-expansion
[{"type":"SEMVER","events":[{"introduced":"5.0.0"},{"fixed":"5.0.6"}]}]