Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend Service:port but configure different backendRef filters to the same child service and apply only one route's filter set to all requests reaching that backend. In Gateway deployments where backendRef filters set security-sensitive headers, such as tenant identity, authorization context, or values the backend trusts, an attacker who can create an accepted HTTPRoute sharing the same backend Service:port may cause their route's filter context to be applied to another route's requests, potentially crossing namespace boundaries when a ReferenceGrant permits cross-namespace targeting. This issue is fixed in version v3.7.6.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 3.7.0, < 3.7.6 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/8aada7a7d52e4588a75386d8b86d270f6fe8d5Patch
- https://github.com/traefik/traefik/pull/13367Issue Tracking
- https://github.com/traefik/traefik/releases/tag/v3.7.6Release Notes
- https://github.com/traefik/traefik/security/advisories/GHSA-6p8f-p8j2-rqmvPatchVendor Advisory
FAQ
What is CVE-2026-54765?
CVE-2026-54765 is a vulnerability with a CVSS score of 8.5 (HIGH). Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend ...
How severe is CVE-2026-54765?
CVE-2026-54765 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54765?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.