CVE-2026-54761 Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple WRR backendRefs, Traefik evaluates the allowlis...

CVE-2026-54761

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple WRR backendRefs, Traefik evaluates the allowlis...

CVE-2026-54761

Traefik vulnerability CVE-2026-54761 affects the Kubernetes Gateway provider: prior to 3.6.21 and 3.7.5, the crossProviderNamespaces allowlist is checked against backendRef.namespace instead of the HTTPRoute’s own namespace, enabling an attacker in a non-allowlisted namespace to reference interna...

Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services

Summary There is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple WRR backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own...

GHSA-3G6V-2R68-PRFC Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services

Summary There is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple WRR backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own...

PT-2026-50495

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 3.6.21 Traefik versions prior to 3.7.5 Description An issue exists in the Kubernetes Gateway provider regarding the crossProviderNamespaces allowlist. When HTTPRoute rules declare multiple backendRefs Weighted Round...