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CVE-2026-9256
high
CVSS 8.1
Vulnerability in nginx (CVE-2026-9256)
Summary
vulnerability in nginx (CVE-2026-9256). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `1.24.0, 1.30.2, 1.31.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-9256** has been found in nginx.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade nginx to **1.24.0, 1.30.2, 1.31.1** or later.
If unsure, ask your IT team or search "nginx CVE-2026-9256" on the vendor's site.
CVE-2026-9256 (nginx) — CWE-122 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `1.24.0, 1.30.2, 1.31.1` — 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-122) exists in nginx.
📍 Affected scope
nginx — .
🔥 Severity
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **1.24.0, 1.30.2, 1.31.1**.
🛡️ 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。
-
6Apply patch patch
Upgrade nginx to 1.24.0, 1.30.2, 1.31.1ステージング環境で 1.24.0, 1.30.2, 1.31.1 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。
-
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
Bitnami
nginx
[{"type":"SEMVER","events":[{"introduced":"0.1.17"},{"fixed":"1.24.0"},{"introduced":"1.30.0"},{"fixed":"1.30.2"},{"introduced":"1.31.0"},{"fixed":"1.31.1"}]}]
Bitnami
nginx-gateway
[{"type":"SEMVER","events":[{"introduced":"0.1.17"},{"fixed":"2.2.1"}]}]
References
- advisory af854a3a-2127-422b-91ae-364da2661108
- patch [email protected]
- web https://nvd.nist.gov/vuln/detail/CVE-2026-9256
- web https://github.com/advisories/GHSA-h78r-86c6-jgp4
- web af854a3a-2127-422b-91ae-364da2661108
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c