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CVE-2026-41650
medium
CVSS 6.1
Vulnerability in fast-xml-parser (CVE-2026-41650)
Summary
vulnerability in fast-xml-parser (CVE-2026-41650). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `5.7.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-41650** has been found in fast-xml-parser.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade fast-xml-parser to **5.7.0** or later.
If unsure, ask your IT team or search "fast-xml-parser CVE-2026-41650" on the vendor's site.
CVE-2026-41650 (fast-xml-parser) — CWE-91 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Patched: `5.7.0` — 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-91) exists in fast-xml-parser.
📍 Affected scope
fast-xml-parser — .
🔥 Severity
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.7.0**.
🛡️ 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 request patterns matching this CVE's known IOCs. Run `grep -r 'fast-xml-parser' .` 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 'fast-xml-parser' . | 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 `fast-xml-parser` 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 fast-xml-parser to 5.7.0ステージング環境で 5.7.0 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。
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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
fast-xml-parser
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.7.0"}]}]