Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef

Summary There is a medium severity vulnerability in Traefik's Kubernetes CRD provider. When providers.kubernetesCRD.allowCrossNamespace is disabled — the default — cross-namespace @kubernetescrd references are rejected for middlewares, TLS options and HTTP/TCP ServersTransports, but the same...

PT-2026-60690

Name of the Vulnerable Software and Affected Versions Envoy Gateway versions prior to 1.7.4 Envoy Gateway versions prior to 1.8.1 Description Envoy Gateway allows extension-managed custom backendRefs from an HTTPRoute to a backend resource in a different namespace without requiring a correspondin...