← Back
CVE-2026-23941
critical
CVSS 9.4
Vulnerability in nginx (CVE-2026-23941)
Summary
vulnerability in nginx (CVE-2026-23941). Confidential information can be exposed externally.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-23941** has been found in nginx.
Confidential information can be exposed externally. CVSS score: 9.4/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "nginx CVE-2026-23941" on the vendor's site.
CVE-2026-23941 (nginx) — CWE-444 / CVSS v3 9.4
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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-444) exists in nginx.
📍 Affected scope
nginx — .
🔥 Severity
Severity: Critical (CVSS 9.4/10). Confidential information can be exposed externally
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ 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 'nginx' .` 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
-
1Identify exposure identify
grep -r 'nginx' . | 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 `nginx` を grep し、稼働しているサービス・バージョンを把握する。
-
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。
References
- advisory https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7
- advisory 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- patch https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6
- patch https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18
- patch https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b
- web https://www.erlang.org/doc/system/versions.html#order-of-versions
- web https://cna.erlef.org/cves/CVE-2026-23941.html