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CVSS 10.0CVSS 10.0 · CRITICAL

CVE-2026-35051

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

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Análisis

Traefik, a popular reverse proxy and load balancer, contains a critical authentication bypass vulnerability in its ForwardAuth middleware. Impact occurs when Traefik is behind a trusted upstream proxy with specific configurations, potentially allowing unauthorized access to backend services. Users should update to versions 2.11.43, 3.6.14, or 3.7.0-rc.2 immediately.

Severidad

Puntaje: 10.0(CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
AV: NETWORK
AC: LOW
PR: NONE
UI: NONE
S: CHANGED
C: HIGH
I: HIGH
A: NONE
Tipo de falla (CWE): CWE-345

EPSS

Probabilidad de explotación (próx. 30 días): 0.0002 (0.0%)
Percentil: 4.2%
EPSS: 2026-05-14

Afecta

traefik:traefik

Descripción técnica

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

Publicada: 30/4/2026, 21:16:32
Última modificación: 1/5/2026, 17:45:41

Referencias

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