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CVE-2026-114641— Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Traefik 2.11.x（2.11.58 之前的版本）和 3.x（3.7.14 之前的版本）中，NTLM 和 Kerberos（Negotiate）后端认证存在竞态条件。该问题源于对每连接粘性往返（sticky round tripper）槽位的读写操作缺乏同步机制。远程攻击者可以通过单个连接并发发送 HTTP/2 或 HTTP/3 请求，从而导致后端连接被孤立、破坏基于连接的认证机制，或致使 Traefik 进程崩溃。

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-114641

Vulnerability Information
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Vulnerability Title
Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 2.11.0 ~ 2.11.58 -
traefik traefik 3.0.0 ~ 3.7.14 -

II. Public POCs for CVE-2026-114641

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III. Intelligence Information for CVE-2026-114641

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Other References for CVE-2026-114641 (2)

Same Patch Batch · traefik · 2026-10-22 · 9 CVEs total

CVE-2026-114638 8.7 HIGH Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision
CVE-2026-114640 8.7 HIGH Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Router
CVE-2026-114639 8.7 HIGH Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool
CVE-2026-114635 8.7 HIGH Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
CVE-2026-114642 8.7 HIGH Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper
CVE-2026-114637 8.7 HIGH Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
CVE-2026-114636 8.7 HIGH Traefik v3.7.13 Authentication Bypass via ssl-passthrough Ingress HTTP Router
CVE-2026-114656 7.5 HIGH Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-362

V. Comments for CVE-2026-114641

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