Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 3.7.0, < 3.7.7 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4Patch
- https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhjVendor Advisory
- https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httpThird Party Advisory
FAQ
What is CVE-2026-65601?
CVE-2026-65601 is a vulnerability with a CVSS score of 8.8 (HIGH). 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, Tra...
How severe is CVE-2026-65601?
CVE-2026-65601 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-65601?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.