CVE-2026-53718

A flaw was found in Envoy Gateway. An attacker could exploit a vulnerability in how HTTPRoute handles custom backend references. This allows a route-owning namespace to access and utilize resources in another namespace without proper authorization, bypassing the intended Gateway API cross-namespa...

CVE-2026-53718

Envoy Gateway prior to 1.7.4 and 1.8.1 contains a cross-namespace authorization bypass in the custom-backend branch of internal/gatewayapi/route.go. The omitted validateBackendNamespace check allows an HTTPRoute to use an extension-managed custom backendRef to reference a backend resource in anot...

CVE-2026-53718 Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API...

EUVD-2026-78072

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API...

CVE-2026-53718: Missing Authorization

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API...

GO-2026-6205 Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port in github.com/traefik/traefik

Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port in github.com/traefik/traefik...

GO-2026-6198 Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion

Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports from vulnerability scanners, please...

PT-2026-80435

Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port in github.com/traefik/traefik...

PT-2026-80429

Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports from vulnerability scanners, please...

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A proof of concept exploit for an authorization bypass vulnerability in Traefik version 3.7.9. The vulnerability affects the Kubernetes Gateway API provider and results from ambiguous dynamic configuration object identifiers constructed by joining namespace and object names with hyphens. Differen...

Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port

Summary There is a medium severity vulnerability in Traefik's Kubernetes Gateway API provider. When two accepted HTTPRoutes target the same backend Service:port but configure different backendRef filters, Traefik may resolve both routes to the same child service and apply only one route's filter...

GHSA-6P8F-P8J2-RQMV Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port

Summary There is a medium severity vulnerability in Traefik's Kubernetes Gateway API provider. When two accepted HTTPRoutes target the same backend Service:port but configure different backendRef filters, Traefik may resolve both routes to the same child service and apply only one route's filter...

CVE-2026-71327: Use of Multiple Resources with Duplicate Identifier

Traefik is an open source HTTP reverse proxy and load balancer. From 3.0.0 until 3.6.25 and 3.7.10, Traefik's Kubernetes Gateway API provider in pkg/provider/kubernetes/gateway/httproute.go, grpcroute.go, tcproute.go, and tlsroute.go builds HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute router and...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization through improper namespace resolution in the extensionRef process. An attacker can cause unauthorized middleware from a backend namespace to be bound to a route by crafting a malicious HTTPRoute with...

PT-2026-68799

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 3.6.25 Traefik versions prior to 3.7.10 Description Traefik's Kubernetes Gateway API provider incorrectly constructs router and service identities for HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute objects by...

CVE-2026-54765

A flaw was found in Traefik's Kubernetes Gateway API provider. An attacker capable of creating an accepted HTTPRoute that shares the same backend Service and port could exploit this vulnerability. The system may incorrectly apply the attacker's route filter context to another route's requests,...

GHSA-6MXQ-JR92-3H2R 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-2026-65601 Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules.backendRefs.filters.extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route auth...

CVE-2026-65601 Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules.backendRefs.filters.extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route auth...

CVE-2026-65601

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules.backendRefs.filters.extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route auth...