CVE-2026-54761-poc

CVE-2026-54761: Traefik Kubernetes Gateway crossProviderNamespaces Bypass PoC English version 概要 このリポジトリは、Traefik の Kubernetes Gateway provider に存在する高深刻度の脆弱性 CVE-2026-54761 を、ローカル環境で再現するための Proof of Concept PoC です。 この脆弱性は crossProviderNamespaces の許可リストに影響します。複数の重み付きバックエンド参照を宣言する HTTPRoute...

CVE-2026-85594

A flaw was found in Traefik. The software fails to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation within the Kubernetes Ingress provider. This vulnerability allows a namespace-limited tenant, even if excluded from the...

SUSE CVE-2026-85594

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594 Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594 Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594 Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its S...

CVE-2026-85594

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

CVE-2026-85594: Authorization Bypass Through User-Controlled Key

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via pkg/provider/kubernetes/crd/kubernetestcp.go through makeTCPServersTransportKey when processing IngressRouteTCP service serversTransport references. An attacker can make Traefik accept a forbidden...

CVE-2026-65602

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references the allowlist was only enforced for HTTP serversTransport references. A low-privileged Kubernetes user in a namespace not listed in...

CVE-2026-65602

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references the allowlist was only enforced for HTTP serversTransport references. A low-privileged Kubernetes user in a namespace not listed in...

CVE-2026-65602 Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references the allowlist was only enforced for HTTP serversTransport references. A low-privileged Kubernetes user in a namespace not listed in...

CVE-2026-65602: Incorrect Authorization

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references the allowlist was only enforced for HTTP serversTransport references. A low-privileged Kubernetes user in a namespace not listed in...

PT-2026-68944

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-42cj-m3vj-89wv. This link is maintained to preserve external references. Original Description Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for...

CVE-2026-54761: Improper Access Control

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...