GHSA-62FC-8686-HFMQ 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...

EUVD-2026-54293

Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a...

Duplicate Advisory: Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-qq9q-x9w4-chhj. This link is maintained to preserve external references. Original Description Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API...

CVE-2026-54765

CVE-2026-54765 affects Traefik v3.7.0 through v3.7.5, fixed in v3.7.6. In the Kubernetes Gateway API provider, two accepted HTTPRoutes targeting the same backend Service:port can have different backendRef filters, with only one route’s filter set applied to all requests. This can allow a route’s ...

BIT-NGINX-GATEWAY-FABRIC-2026-32682 NGINX Gateway Fabric vulnerability

When NGINX Gateway Fabric is configured using GRPCRoutes, an authenticated, remote attacker with permission to create or modify GRPCRoute resources can cause the NGINX Gateway Fabric control plane to terminate by sending undisclosed GRPCRoute configurations containing backendRef filters. Note:...

Exploit for CVE-2026-54761

CVE-2026-54761: Traefik Kubernetes Gateway crossProviderNamesp...

EUVD-2026-37793

When NGINX Gateway Fabric is configured using GRPCRoutes, an authenticated, remote attacker with permission to create or modify GRPCRoute resources can cause the NGINX Gateway Fabric control plane to terminate by sending undisclosed GRPCRoute configurations containing backendRef filters. Note:...

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...