CVE-2026-54764
Description
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
How to fix
- traefik traefik2.11.51, 3.6.22, 3.7.6 or later
- github.com/traefik/traefik/v22.11.51 or later
- github.com/traefik/traefik/v33.6.22, 3.7.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| traefik traefik | v < 2.11.51, 3.0.0 ≤ v < 3.6.22, 3.7.0 ≤ v < 3.7.6 | 2.11.51, 3.6.22, 3.7.6 |
| github.com/traefik/traefik/v2Go | v < 2.11.51 | 2.11.51 |
| github.com/traefik/traefik/v3Go | v < 3.6.22, 3.7.0 ≤ v < 3.7.6 | 3.6.22, 3.7.6 |
| github.com/traefik/traefikGo | v ≤ 1.7.34, No range specified | — |
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