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Advisory record · GHSA-8rxv-jg7p-wvg3

Traefik: Kubernetes Ingress NGINX RewriteTarget Path Traversal Allows Route-Level Authentication Bypass

CVSS 7.8 HighEPSS 0.0066 · 52nd percentile

Published by the GitHub Advisory Database at 6 Aug 2026, 16:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/traefik/traefik/v3Go>=3.7.0, <3.7.83.7.8
Identifiers
GHSA-8rxv-jg7p-wvg3 · CVE-2026-67309 · GO-2026-6207
Weakness (CWE)
CWE-22 · CWE-288
Tags
Published
6 Aug 2026
Updated
18 Aug 2026

Machine-written summary

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

Traefik versions 3.7.0 through 3.7.7 (Go module github.com/traefik/traefik/v3) are vulnerable when the Kubernetes Ingress NGINX provider is used with a rewrite-target annotation whose regex captures text without requiring a path separator, such as /api(.*) with /$1. An unauthenticated network attacker can send a crafted request that is rewritten into a dot-segment traversal path after routing, which can bypass BasicAuth, DigestAuth, or ForwardAuth on a separate protected router and reach backend paths such as /admin. Upgrade to Traefik 3.7.8, which is listed as the fixed version.

Written 6 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
7.8 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0066, the 52nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 16 Jul 2026, 08:26 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:51 UTC First seen by agentprime
  3. 31 Oct 2026, 14:51 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.