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CVE-2026-114637— Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak

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.

v3.2.0 至 v3.7.14 版本之前的 Traefik 在实验性的 FastProxy 连接池中存在身份验证绕过漏洞。该漏洞导致经过 NTLM 或 Negotiate 身份验证的后端连接未能正确绑定到其对应的前端连接。未经验证的客户端可被分配一个已建立持久连接（keep-alive）的后端连接池中的连接，而该连接此前已被受害者用于完成 NTLM 或 Negotiate 身份验证握手。这使得攻击者能够读取受害者的数据，并冒充该受害者进行操作。

CVSS 8.7 · High
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I. Basic Information for CVE-2026-114637

Vulnerability Information
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Vulnerability Title
Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对错误会话暴露数据元素
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 3.2.0 ~ 3.7.14 -

II. Public POCs for CVE-2026-114637

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III. Intelligence Information for CVE-2026-114637

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Other References for CVE-2026-114637 (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-2026-114636 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
CVE-2026-114641 3.7 LOW Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-488

V. Comments for CVE-2026-114637

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