Vulnerability in F5 nginx Ingress Controller
CVE-2026-94197
An authentication and authorization bypass vulnerability exists in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with the `ExternalAuth` policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method routing and method headers are forwarded unsanitized into the internal authentication subrequest (handled by the NGINX auth_request directive). As a result, an unauthenticated, remote attacker may spoof request attributes evaluated by the external authentication provider. Impact: This vulnerability may allow remote attackers unauthenticated access to protected paths. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- my.f5.com/manage/s/article/K000162611 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-94197?
- CVE-2026-94197 is a high-severity vulnerability in F5 nginx Ingress Controller, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2026-10-14.
- How severe is CVE-2026-94197?
- High severity. CVSS v3 base score is 7.5 out of 10.