---
id: CVE-2026-114641
title: >-
  Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round
  Tripper
summary: >-
  Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition
  in NTLM and Kerberos (Negotiate) backend authentication, where the
  per-connection sticky round tripper slot is read and written without
  synchronization. Remote…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-362
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: '2026-10-22T01:43:40.663Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114641'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-mhjw-hmjv-p99x'
    label: GitHub Security Advisory (GHSA-mhjw-hmjv-p99x)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-race-condition-in-ntlm-kerberos-round-tripper
    label: >-
      VulnCheck Advisory: Traefik before 2.11.58 and 3.7.14 Race Condition in
      NTLM/Kerberos Round Tripper
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.183Z'
---

## Overview

Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

## 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.