{"schemaVersion":3,"id":"CVE-2026-53622","aliases":["CGA-fpgm-2m2h-cr43","CGA-hfqf-4jfq-j2m5","GHSA-9cr8-q42q-g8m7","GO-2026-5287","CGA-32m4-7857-9pxc","CGA-5wqv-m99j-v5jf","CGA-6jpj-9ghg-pgqw","CGA-8qpq-q6ph-gx6g","CGA-97m9-wgvg-p9rp","CGA-j34f-gx5q-wm92","CGA-p58q-pmg5-3hmp","CGA-vc77-h9gq-vgcq"],"status":"published","duplicateOf":null,"title":null,"description":"Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake selects the applicable TLS configuration through an exact, case-sensitive lookup on the SNI value, which fails to match wildcard host patterns (e.g., *.example.com) or case variants of the configured hostname. Because the handshake falls back to the default TLS configuration — which may not require client certificates — a client can complete the QUIC handshake without presenting a certificate, while the subsequent HTTP routing layer still dispatches the request to a backend protected by a router-specific mTLS policy. The issue affects deployments where HTTP/3 is enabled, a router uses a wildcard Host rule or case-insensitive hostname matching, a router-specific TLSOptions enforces client certificate authentication, and UDP access to the entrypoint is reachable by an attacker. 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