CVE-2026-65601
CVE-2026-65601 · Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.5% · Fix available
- Published
- Updated
Stack: web
Affected products and versions
traefik
- Versions
- ≥ 3.7.0, < 3.7.7: Affected (semver)
- 3.7.7: Not affected (semver)
Update to 3.7.7
Original sources
- https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
- https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref
- https://nvd.nist.gov/vuln/detail/CVE-2026-65601