A flaw was found in Traefik. A tenant with write access to an HTTPRoute resource can exploit this vulnerability by injecting specially crafted rule tokens into Traefik's router rule language through unsanitized header or query parameter match values. This allows the attacker to bypass listener hostname constraints in shared gateway deployments, leading to the redirection of traffic intended for legitimate hostnames to attacker-controlled backends.

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, 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. This vulnerability is fixed in 3.6.10.

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A ...

Traefik: kubernetes gateway rule injection via unescaped backticks in HTTPRoute match values