high8.8
CVE-2026-65601
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | Traefik | >= 3.7.0, < 3.7.7 | 3.7.7 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Traefik | Traefik | from 3.7.0 before 3.7.7 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-qq9q-x9w4-chhj
- https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj
- https://nvd.nist.gov/vuln/detail/CVE-2026-65601
- https://github.com/traefik/traefik/pull/13462
- https://github.com/traefik/traefik/commit/655d6324ab4a1475892a958d4bae389720a67ea9
- https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0