Vulnerability Description
Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references). A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. This is fixed in 3.6.23 and 3.7.7.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 3.6.0, < 3.6.23 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4Patch
- https://github.com/traefik/traefik/security/advisories/GHSA-42cj-m3vj-89wvVendor Advisory
- https://www.vulncheck.com/advisories/traefik-before-ingressroutetcp-serverstransThird Party Advisory
FAQ
What is CVE-2026-65602?
CVE-2026-65602 is a vulnerability with a CVSS score of 8.8 (HIGH). Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for ...
How severe is CVE-2026-65602?
CVE-2026-65602 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-2026-65602?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.