CVE-2026-41174— Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

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授权机制不正确

Traefik 安全漏洞

Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在安全漏洞，该漏洞源于Kubernetes CRD提供程序跨命名空间隔离执行不完整，未对Chain中间件内嵌套的中间件引用应用限制，可能导致绕过隔离边界。

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