---
id: CVE-2026-65602
title: >-
  Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the
  crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport
  references (the allowlist was only enforced for HTTP serversTransport
  references)
summary: >-
  Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the
  crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport
  references (the allowlist was only enforced for HTTP serversTransport
  references). A …
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 >= 3.6.0, < 3.6.23'
  - 'traefik >= 3.7.0, < 3.7.7'
patched:
  - traefik 3.7.7
published: '2026-07-22'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:29.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65602'
references:
  - url: >-
      https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
    label: disclosure@vulncheck.com
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-42cj-m3vj-89wv'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-ingressroutetcp-serverstransport-namespace-bypass
    label: disclosure@vulncheck.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65602'
  - url: 'https://github.com/traefik/traefik/pull/13458'
  - url: >-
      https://github.com/traefik/traefik/commit/67501cbe7bc7774e26ecbd1c29af97f098e14b0b
  - url: 'https://github.com/traefik/traefik/releases/tag/v3.6.23'
  - url: 'https://github.com/traefik/traefik/releases/tag/v3.7.7'
  - url: 'https://github.com/advisories/GHSA-42cj-m3vj-89wv'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-22T13:04:30.399873Z'
scores:
  nvd: 8.8
  cna: 5.3
epss: 0.00333
epssPercentile: 0.26349
aliases:
  - GHSA-42cj-m3vj-89wv
ecosystem: go
ingestedAt: '2026-08-05T22:52:54.071Z'
---

## Overview

Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references). A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. This is fixed in 3.6.23 and 3.7.7.

## Affected

- `traefik >= 3.6.0, < 3.6.23`
- `traefik >= 3.7.0, < 3.7.7`

## Remediation

Upgrade past the affected range:

- `traefik 3.7.7`

## Package advisory (CVE-2026-65602)

Affected packages:

- `github.com/traefik/traefik/v3 >= 3.6.0, <= 3.6.22`
- `github.com/traefik/traefik/v3 >= 3.7.0, <= 3.7.6`

Patched in:

- `github.com/traefik/traefik/v3 3.6.23`
- `github.com/traefik/traefik/v3 3.7.7`

Source: https://github.com/advisories/GHSA-42cj-m3vj-89wv