CVE-2026-65602 Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass
Low-privileged Kubernetes users can bypass namespace restrictions to access privileged TCP transport configurations, potentially exposing mTLS certificates or identities.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-65602?
CVE-2026-65602 is a medium-severity missing authorization vulnerability in Traefik Traefik, published on 22 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-65602?
7 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v3 Go | From 3.6.0 | 3.6.23, 3.7.7 |
github.com/traefik/traefik/v3 Go | From 3.6.0 | 3.6.23 |
github.com/traefik/traefik/v3 Go | From 3.6.0 | 3.6.23 |
github.com/traefik/traefik/v3 Go | From 3.7.0 | 3.7.7 |
github.com/traefik/traefik/v3 Go | From 3.7.0 | 3.7.7 |
github.com/traefik/traefik Go | All versions | None |
1 more packages
github.com/traefik/traefik/v2 Go | All versions | None |
Products include Traefik Traefik.
How do I fix CVE-2026-65602?
Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.6.23 or 3.7.7.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-65602 being exploited?
There is no known exploitation of CVE-2026-65602 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as GHSA-42cj-m3vj-89wv, GO-2026-6192, MINI-48hf-w95q-mg55, MINI-jx4j-qf66-p4mq, MINI-rfwr-f2pg-w44f.