CVE-2026-29777: Traefik: kubernetes gateway rule injection via unescaped backticks in HTTPRoute match values

There is a potential vulnerability in Traefik’s Kubernetes Gateway provider related to rule injection.

A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik’s router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends.