Vulnerability in nginx-gateway-fabric (CVE-2026-11311)
Summary
Vulnerability in nginx-gateway-fabric (CVE-2026-11311). Confidential information can be exposed externally. Mitigation: upgrade to 2.6.4 or later.
Original description
The description as published by the source.
When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the NginxProxy Custom Resource Definition serverTokens field and the AuthenticationFilter Custom Resource Definition extraAuthArgs field are rendered directly into NGINX configuration templates without sanitization or escaping. An authenticated attacker with permission to create or modify these Custom Resource Definitions may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure from the vulnerability trigger itself.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-11311 has been found in nginx-gateway-fabric.
Confidential information can be exposed externally. CVSS score: 8.1/10.
What to do: upgrade nginx-gateway-fabric to 2.6.4 or later.
If unsure, ask your IT team or search "nginx-gateway-fabric CVE-2026-11311" on the vendor's site.
CVE-2026-11311 (nginx-gateway-fabric) — CWE-74 / CVSS v3 8.1
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.6.4 — 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.
A vulnerability (CWE-74) exists in nginx-gateway-fabric.
Check the vendor advisory for the affected versions of nginx-gateway-fabric.
Severity: High (CVSS 8.1/10). Confidential information can be exposed externally.
Update to 2.6.4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'nginx-gateway-fabric' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'nginx-gateway-fabric' . | 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-gateway-fabricを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade nginx-gateway-fabric to 2.6.4ステージング環境で 2.6.4 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を含めること。
-
3Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-11311 nginx
References
- advisory my.f5.com
- web nvd.nist.gov
- web github.com