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OpenAdvisories
High · 8.8 Public exploit CVE-2026-88009 EUVD-2026-75578GHSA-f52w-8j3h-j724GO-2026-6465

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

Published Sep 10, 2026 · Updated Sep 10, 2026 · Assigned by GitHub_M

Vendor: traefik Product: traefik Package: github.com/traefik/traefik Package: github.com/traefik/traefik/v2 Package: github.com/traefik/traefik/v3 Package: traefik-3.6 Ecosystem: Go Ecosystem: Wolfi

Description

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.

Affected products

VendorProductAffectedFixed
traefik traefik < 2.11.57, >= 3.0.0, < 3.7.13 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 govulncheck-vulndb 0.0.20260916T180043-160000.1.1 SUSE-SU-2026:23863-1, SUSE-SU-2026:23855-1
SLES 16.0 govulncheck-vulndb 0.0.20260916T180043-160000.1.1 SUSE-SU-2026:23863-1, SUSE-SU-2026:23855-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed traefik 3.7.13-1.1 openSUSE-SU-2026:12076-1
openSUSE Leap 16.0 govulncheck-vulndb 0.0.20260916T180043-160000.1.1 openSUSE-SU-2026:21897-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling traefik-3.6 No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • Boreas37/CVE-2026-88009-PoC ★ 0 · Oct 25, 2026

    CVE-2026-88009 — Traefik forwards a rootless opaque request target that routing/forwardAuth see as '/'. Auth bypass + access-log evasion, verified v3.7.10 / v3.7.13.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Go github.com/traefik/traefik all versions — GO-2026-6465
Go github.com/traefik/traefik/v2 < 2.11.57 2.11.57 GHSA-f52w-8j3h-j724
Go github.com/traefik/traefik/v3 >= 3.0.0, < 3.7.13 3.7.13 GHSA-f52w-8j3h-j724

Advisories 4

References