---
id: CVE-2026-114637
title: >-
  Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool
  Identity Leak
summary: >-
  Traefik from v3.2.0 before v3.7.14 contains an authentication bypass
  vulnerability in the experimental FastProxy connection pool, which fails to
  pin NTLM/Negotiate-authenticated backend connections to their frontend
  connection. Unauthent…
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-488
vendor: traefik
product: traefik
affected:
  - traefik >= 3.2.0 < 3.7.14
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:43:37.851Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114637'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35'
    label: GitHub Security Advisory (GHSA-53qr-784g-cj35)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotiate-connection-pool-identity-leak
    label: >-
      VulnCheck Advisory: Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate
      Connection Pool Identity Leak
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.183Z'
---

## Overview

Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.

## Affected

- `traefik >= 3.2.0 < 3.7.14`

## Remediation

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