CVE-2026-48491
Gravedad CVSS v4.0:
ALTA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
23/06/2026
Última modificación:
15/07/2026
Descripción
*** Pendiente de traducción *** 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 never applies wildcard matching. If another permissive SNI is served on the same entrypoint, an attacker can complete the TLS handshake under the permissive options and then send an HTTP Host header targeting the wildcard-protected backend, reaching it without presenting a client certificate. This affects the regular HTTPS / HTTP-2 path and does not require HTTP/3. This vulnerability is fixed in 3.7.3.
Impacto
Puntuación base 4.0
7.80
Gravedad 4.0
ALTA
Puntuación base 3.x
10.00
Gravedad 3.x
CRÍTICA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | 3.7.0 (incluyendo) | 3.7.3 (excluyendo) |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página
Referencias a soluciones, herramientas e información
- https://github.com/traefik/traefik/releases/tag/v3.7.3
- https://github.com/traefik/traefik/security/advisories/GHSA-5r4w-85f3-pw66
- https://access.redhat.com/security/cve/CVE-2026-48491
- https://bugzilla.redhat.com/show_bug.cgi?id=2491923
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48491.json