Security advisory for Traefik from 3.7.0-ea.1

Advisory overview

Traefik from 3.7.0-ea.1 before 3.7.15 contains an authentication bypass vulnerability in the Kubernetes Ingress NGINX provider that silently disables mTLS configured via the auth-tls-secret annotation. When another Ingress declares a path on the same host without matching auth-tls settings, Traefik falls back to default TLS options, letting unauthenticated attackers reach backends requiring client certificates.

Related references

• https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr
• https://www.vulncheck.com/advisories/traefik-3.7.0-ea.1-before-3.7.15-mtls-bypass-via-ingress-nginx-provider