Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0028, the 20th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 1 Jul 2026, 15:21 UTC Published by the maintainers as a GitHub repository advisory
2. 31 Oct 2026, 14:50 UTC First seen by agentprime
3. 31 Oct 2026, 14:50 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-3q9r-p662-5j8m
• OSV: GHSA-3q9r-p662-5j8m
• github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m
• nvd.nist.gov/vuln/detail/CVE-2026-54764
• github.com/traefik/traefik/pull/13344
• github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d
• github.com/traefik/traefik
• github.com/traefik/traefik/releases/tag/v2.11.51
• github.com/traefik/traefik/releases/tag/v3.6.22
• github.com/traefik/traefik/releases/tag/v3.7.6

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.