PT-2026-55998 · Traefik · Traefik

Pig-Tail · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-54764

Mitre

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

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.

Fix

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

CVE-2026-54764

Affected Products

Traefik

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-54764 · Security Note
• https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m · Note
• https://github.com/traefik/traefik/pull/13344 · Note
• https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d · Note