CVE-2026-41263— Traefik: BasicAuth middleware: timing side-channel vulnerability

Traefik: BasicAuth middleware: timing side-channel vulnerability

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

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通过时间差异性导致的信息暴露

Traefik 安全漏洞

Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在安全漏洞，该漏洞源于BasicAuth中间件中用于常量时间比较的变量始终解析为空字符串，导致比较短路，可能允许攻击者通过响应时间差异枚举有效用户名。

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