---
id: CVE-2026-65601
title: >-
  Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion
  vulnerability in the Kubernetes Gateway API provider
summary: >-
  Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion
  vulnerability in the Kubernetes Gateway API provider. When resolving
  HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the
  backend Service namespa…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-863
vendor: traefik
product: traefik
affected:
  - 'traefik >= 3.7.0, < 3.7.7'
patched:
  - traefik 3.7.7
published: '2026-07-22'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:29.010'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65601'
references:
  - url: >-
      https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
    label: disclosure@vulncheck.com
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref
    label: disclosure@vulncheck.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65601'
  - url: 'https://github.com/traefik/traefik/pull/13462'
  - url: >-
      https://github.com/traefik/traefik/commit/655d6324ab4a1475892a958d4bae389720a67ea9
  - url: 'https://github.com/advisories/GHSA-qq9q-x9w4-chhj'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-23T13:51:09.038759Z'
scores:
  nvd: 8.8
  cna: 5.3
epss: 0.00512
epssPercentile: 0.43456
aliases:
  - GHSA-qq9q-x9w4-chhj
ecosystem: go
ingestedAt: '2026-08-05T21:52:35.646Z'
---

## Overview

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

## Affected

- `traefik >= 3.7.0, < 3.7.7`

## Remediation

Upgrade past the affected range:

- `traefik 3.7.7`

## Package advisory (CVE-2026-65601)

Affected packages:

- `Traefik >= 3.7.0, < 3.7.7`

Patched in:

- `Traefik 3.7.7`

Source: https://github.com/advisories/GHSA-qq9q-x9w4-chhj