CVE-2026-65602
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.
How to fix
- traefik traefik3.6.23, 3.7.7 or later
- github.com/traefik/traefik/v33.6.23, 3.7.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| traefik traefik | 3.6.0 ≤ v < 3.6.23, 3.7.0 ≤ v < 3.7.7 | 3.6.23, 3.7.7 |
| github.com/traefik/traefik/v3Go | 3.6.0 ≤ v < 3.6.23, 3.7.0 ≤ v < 3.7.7 | 3.6.23, 3.7.7 |
| github.com/traefik/traefikGo | No range specified | — |
| github.com/traefik/traefik/v2Go | No range specified | — |
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