CVE-2026-65601
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| traefik | traefik | 3.7.0 < 3.7.7 | affected |
| traefik | traefik | 3.7.7 | unaffected |
Weaknesses
- CWE-863: Incorrect Authorization
References
- 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
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.