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CVE-2026-32595— Traefik: BasicAuth Middleware Timing Attack Allows Username Enumeration

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是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.40及之前版本、3.0.0-beta1至3.6.11版本和3.7.0-ea.1版本存在安全漏洞，该漏洞源于BasicAuth中间件存在时间差，可能导致用户名枚举。

AI Predicted 5.3 Difficulty: Easy EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1590.004 · Network Topology
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I. Basic Information for CVE-2026-32595

Vulnerability Information
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Vulnerability Title
Traefik: BasicAuth Middleware Timing Attack Allows Username Enumeration
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.40及之前版本、3.0.0-beta1至3.6.11版本和3.7.0-ea.1版本存在安全漏洞，该漏洞源于BasicAuth中间件存在时间差，可能导致用户名枚举。
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 < 2.11.41 -

II. Public POCs for CVE-2026-32595

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III. Intelligence Information for CVE-2026-32595

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Vendor Advisories for CVE-2026-32595 (1)

Vendor Pages for CVE-2026-32595 (3)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-208

V. Comments for CVE-2026-32595

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