CVE-2026-65602: Traefik

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Traefik Traefik: from 3.6.0, before 3.6.23 (fixed in 3.6.23); from 3.7.0, before 3.7.7 (fixed in 3.7.7)

Published 2026-07-22. Last modified 2026-10-08.