Vulnerability in traefik

[ Description ]Official description

Traefik 3.7.11 before 3.7.15 contains an authorization bypass in the Kubernetes Ingress NGINX provider that skips the cross-namespace check on the auth-tls-secret annotation when a cached client authentication TLS option is reused. Users who can create Ingresses can reference another namespace's CA secret already used by another Ingress, enforcing it on their own routes and learning whether it exists, without disclosure of its contents.

[ Fixes ]Fixes and patches

• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• BSI CERT-Bund1 Nov 2026WID-SEC-2026-4271

  Traefik: Multiple vulnerabilities allow bypassing security measures Translated from German

  CVE-2026-119573CVE-2026-119572

[ References ]References

• github.com/traefik/traefik/security/advisories/GHSA-28hp-c82p-8vqjPatchVendor Advisory
• www.vulncheck.com/advisories/traefik-3.7.11-before-3.7.15-cross-namespace-authorization…Third Party Advisory