CVE-2026-65602 – Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

CVE ID :CVE-2026-65602

Published : July 22, 2026, 11:21 a.m. | 24 minutes ago

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.

Severity: 5.3 | MEDIUM

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