GHSA-7M3P-WC52-RMC6: traefik Go

Vulnerability summary

GHSA-7M3P-WC52-RMC6 is a medium (CVSS 5.3) vulnerability in traefik Go.

Timeline

1. 22-07-2026
   PublishedVulnerability first disclosed.
2. 05-08-2026
   Last modifiedVulnerability information updated.

Description

Duplicate Advisory: Traefik CRD IngressRouteTCP ServersTransport Cross-Provider Namespace Bypass ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-42cj-m3vj-89wv. This link is maintained to preserve external references. ## Original 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.

No weakness data has been published for this record.