CVE-2026-85596

Description

Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treats this as a TLS options conflict and falls back to the entry point's default TLS configuration, which does not request a client certificate, so a route configured with nginx.ingress.kubernetes.io/auth-tls-verify-client: "on" becomes reachable without a client certificate. Only the v3.7 line is affected; the issue is fixed in v3.7.11.

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Produits concernés

• traefik
• Traefik traefik

Scores CVSS

Faiblesses (CWE)

• CWE-287

Références

• https://github.com/traefik/traefik/security/advisories/GHSA-j994-9gqj-9hwq ExploitMitigationPatchVendor Advisory
• https://www.vulncheck.com/advisories/traefik-3.7-authentication-bypass-via-tls-option-conflict Third Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories