Traefik up to 3.6.22/3.7.6 IngressRouteTCP serversTransport certificate validation

Summaryinfo

A vulnerability, which was classified as problematic, was found in Traefik up to 3.6.22/3.7.6. The affected element is an unknown function of the component IngressRouteTCP. Executing a manipulation of the argument serversTransport can lead to certificate validation. This vulnerability is registered as CVE-2026-65602. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Traefik up to 3.6.22/3.7.6. It has been declared as problematic. This vulnerability affects some unknown functionality of the component IngressRouteTCP. The manipulation of the argument serversTransport with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-65602 since 07/22/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1587.003.

Upgrading to version 3.6.23 or 3.7.7 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Traefik

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 3.6.12
• 3.6.13
• 3.6.14
• 3.6.15
• 3.6.16
• 3.6.17
• 3.6.18
• 3.6.19
• 3.6.20
• 3.6.21
• 3.6.22
• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6

Website

• Product: https://github.com/traefik/traefik/

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