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CVE-2026-25949— Traefik: TCP readTimeout bypass via STARTTLS on Postgres

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.

authentik是authentik开源的一个开源身份提供应用程序。 authentik 3.6.8之前版本存在资源管理错误漏洞，该漏洞源于处理STARTTLS请求时存在潜在漏洞，可能导致未经验证的客户端通过发送Postgres SSLRequest前导并停滞来绕过响应超时，造成拒绝服务。

CVSS 7.5 · High EPSS 0.83% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
traefik traefik < 3.6.8 affected
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I. Basic Information for CVE-2026-25949

Vulnerability Information
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Vulnerability Title
Traefik: TCP readTimeout bypass via STARTTLS on Postgres
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个开源身份提供应用程序。 authentik 3.6.8之前版本存在资源管理错误漏洞，该漏洞源于处理STARTTLS请求时存在潜在漏洞，可能导致未经验证的客户端通过发送Postgres SSLRequest前导并停滞来绕过响应超时，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 3.6.8 -

II. Public POCs for CVE-2026-25949

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III. Intelligence Information for CVE-2026-25949

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IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-400

V. Comments for CVE-2026-25949

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