Most recent entries from all

bdu:2026-06479

certfr-2026-avi-0490 — De multiples vulnérabilités ont été découvertes dans Traefik. Elles permettent à un attaquant de provoquer une atteinte…

certfr-2026-avi-0490

CLEANSTART-2026-FI72470 — Security fix for CVE-2026-35051 applied in: forecastle 1.0.159-r1

Affected: CleanStart: forecastle

Security vulnerability affects the forecastle package. This issue is resolved in later releases. See references for vulnerability details.

EUVD-2026-337297

fkie_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.

GHSA-6384-m2mw-rf54 — Traefik's ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass authentication

Affected: Go: github.com/traefik/traefik/v3, Go: github.com/traefik/traefik/v2, Go: github.com/traefik/traefik

## Summary

There is a high-severity authentication bypass vulnerability in Traefik's `ForwardAuth` middleware when `trustForwardHeader=false` is configured and Traefik is deployed behind a trusted upstream proxy.

While `X-Forwarded-*` headers (such as `X-Forwarded-For`, `X-Forwarded-Host`, and `X-Forwarded-Proto`) from trusted context are correctly rebuilt, it does not strip or rebuild `X-Forwarded-Prefix`, leaving any attacker-supplied value intact in the subrequest forwarded to the authentication service.

When the authentication service makes authorization decisions based on `X-Forwarded-Prefix`, an external attacker can spoof a trusted prefix value and gain unauthorized access to protected backend routes.

## Patches

- https://github.com/traefik/traefik/releases/tag/v2.11.43 - https://github.com/traefik/traefik/releases/tag/v3.6.14 - https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2

## For more information

If there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).

<details> <summary>Original Description</summary>

### Summary `ForwardAuth` with `trustForwardHeader=false` still forwards an attacker-controlled `X-Forwarded-Prefix` header to the authentication service when Traefik is deployed behind a trusted upstream proxy. If the auth service relies on `X-Forwarded-Prefix` for authorization or routing decisions, an external attacker can bypass access controls and reach protected backend ro…

openSUSE-SU-2026:10697-1 — traefik-3.6.15-1.1 on GA media

traefik-3.6.15-1.1 on GA media

RHSA-2026:21772 — Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.28.0 Release.

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