---
id: CVE-2026-114639
title: >-
  Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate
  Connection Pool
summary: >-
  Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an
  authentication bypass because a first request preauthenticated with an
  Authorization: Negotiate token authenticates a socket in the globally shared
  backend connection pool…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-287
vendor: traefik
product: traefik
affected:
  - traefik >= 2.11.0 < 2.11.58
  - traefik >= 3.0.0 < 3.7.14
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:43:39.232Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114639'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh'
    label: GitHub Security Advisory (GHSA-qm9f-w54v-q2qh)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool
    label: >-
      VulnCheck Advisory: Traefik before 2.11.58 and 3.7.14 Authentication
      Bypass via Negotiate Connection Pool
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.188Z'
---

## Overview

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.

## Affected

- `traefik >= 2.11.0 < 2.11.58`
- `traefik >= 3.0.0 < 3.7.14`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.