Vulnerability in Traefik
CVE-2026-54764
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Traefik — versions < 2.11.51, >= 3.0.0, < 3.6.22, >= 3.7.0, < 3.7.6
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m (Patch, Vendor Advisory)
- github.com/traefik/traefik/pull/13344 (Issue Tracking)
- github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d (Patch)
Frequently asked questions
- What is CVE-2026-54764?
- CVE-2026-54764 is a medium-severity vulnerability in Traefik, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.8/10. Published 2026-07-06.
- How severe is CVE-2026-54764?
- Medium severity. CVSS v3 base score is 5.8 out of 10.