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Advisory record · GHSA-f52w-8j3h-j724

Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging

CVSS 8.8 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 10 Sept 2026, 23:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/traefik/traefik/v3Go>=3.0.0, <3.7.133.7.13
github.com/traefik/traefik/v2Go<2.11.572.11.57
Identifiers
GHSA-f52w-8j3h-j724 · CVE-2026-88009 · GO-2026-6465
Weakness (CWE)
CWE-444 · CWE-1286
Tags
Published
10 Sept 2026
Updated
17 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Traefik v3 (>=3.0.0, <3.7.13) and Traefik v2 (<2.11.57) are affected. A remote, unauthenticated client can send an HTTP/1.x request with a rootless request-target, which Traefik routes and enforces guards against as path "/" while forwarding the original target unchanged to the backend. This can bypass host-based routing, path-scoped middleware and authorization, and access logging. Upgrade Traefik v3 to 3.7.13 or Traefik v2 to 2.11.57; the source lists no workaround.

Written 1 Nov 2026.

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

ScoreRatingCVSSVectorSource
8.8 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:13 UTC First seen by agentprime
  2. 31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

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.