Traefik up to 3.7.6 Kubernetes Gateway API Provider HTTPRoute.spec.rules rules/backendRefs/filters injection

Summaryinfo

A vulnerability was found in Traefik up to 3.7.6 and classified as critical. This affects an unknown function of the file HTTPRoute.spec.rules of the component Kubernetes Gateway API Provider. The manipulation of the argument rules/backendRefs/filters results in injection. This vulnerability is reported as CVE-2026-65601. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Traefik up to 3.7.6. Affected is an unknown code of the file HTTPRoute.spec.rules of the component Kubernetes Gateway API Provider. The manipulation of the argument rules/backendRefs/filters with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-65601 since 07/22/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 3.7.7 eliminates this vulnerability.

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Productinfo

Name

• Traefik

Version

• 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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