{"@context":"https://openvex.dev/ns/v0.2.0","@id":"https://database.harborguard.co/cve/CVE-2026-48491/vex.json","author":"HarborGuard Database","role":"Document Creator","timestamp":"2026-06-30T03:20:59.654Z","version":1,"tooling":"HarborGuard Database (https://database.harborguard.co)","statements":[{"vulnerability":{"name":"CVE-2026-48491","@id":"https://www.cve.org/CVERecord?id=CVE-2026-48491","description":"Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection (SNICheck) that allows an unauthenticated client to bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard host rule such as Host(*.example.com) with stricter TLS options (for example RequireAndVerifyClientCert), SNICheck resolves the TLS options for the HTTP Host header using exact map lookups only and ne"},"products":[{"@id":"cpe:2.3:a:traefik:traefik:\\>\\=_3.7.0\\,_\\<_3.7.3:*:*:*:*:*:*:*","identifiers":{"cpe23":"cpe:2.3:a:traefik:traefik:\\>\\=_3.7.0\\,_\\<_3.7.3:*:*:*:*:*:*:*"}}],"status":"affected","action_statement":"No fixed version is published yet; monitor the upstream advisory.","timestamp":"2026-06-30T03:20:59.654Z"}]}