CVE-2026-41263

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

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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.

CVSS 6.3 · Средний · EPSS 0,4%

Опубликовано

2026-04-30T20:39:49.658Z

Обновлено

2026-05-01T14:22:40.566Z

Стек: web

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