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

CVE ID :CVE-2026-65601

Published : July 22, 2026, 11:21 a.m. | 24 minutes ago

Description :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 author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

Severity: 5.3 | MEDIUM

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