CVE-2026-32695

Описание

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative rules[].hosts[] was exploitable for host restriction bypass (for example tenant.example.com) || Host(attacker.com), producing a router that serves attacker-controlled hosts. Knative headers[].exact also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant traffic exposure. Versions 3.6.11 and 3.7.0-ea.2 patch the issue.

A flaw was found in Traefik, an HTTP reverse proxy and load balancer. When using the Knative provider, Traefik incorrectly interpolates user-controlled values into router rule expressions without proper escaping. This vulnerability allows an attacker to inject malicious rule syntax, leading to a host restriction bypass. In multi-tenant environments, this can result in unauthorized traffic being routed to victim services, potentially exposing cross-tenant traffic.