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CVE-2026-114639— Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool

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.

Traefik 2.11.0 至 2.11.57 以及 3.0.0 至 3.7.13 版本中存在身份验证绕过漏洞。该漏洞的成因在于：首个携带 令牌进行预身份验证的请求，会将套接字绑定到全局共享的后端连接池中，而该连接池从未实现隔离。因此，来自独立前端连接的未认证攻击者可能被分配该已绑定 NTLM/Kerberos 的套接字，从而以受害者的身份执行读取或写入操作。

CVSS 8.7 · High
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I. Basic Information for CVE-2026-114639

Vulnerability Information
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Vulnerability Title
Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
认证机制不恰当
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-2026-114639

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-114639

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Other References for CVE-2026-114639 (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-2026-114635 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
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-287

V. Comments for CVE-2026-114639

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