CVE-2026-65602
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 referen…
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/traefik/traefik/v3 | >= 3.6.0, <= 3.6.22 | 3.6.23 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Traefik | Traefik | from 3.6.0 before 3.6.23 from 3.7.0 before 3.7.7 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-42cj-m3vj-89wv
- https://github.com/traefik/traefik/security/advisories/GHSA-42cj-m3vj-89wv
- https://nvd.nist.gov/vuln/detail/CVE-2026-65602
- https://github.com/traefik/traefik/pull/13458
- https://github.com/traefik/traefik/commit/67501cbe7bc7774e26ecbd1c29af97f098e14b0b
- https://github.com/traefik/traefik/releases/tag/v3.6.23
- https://github.com/traefik/traefik/releases/tag/v3.7.7
- https://www.vulncheck.com/advisories/traefik-before-ingressroutetcp-serverstransport-namespace-bypass
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0