CVE-2026-27587 – Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass

CVE ID : CVE-2026-27587

Published : Feb. 24, 2026, 4:26 p.m. | 39 minutes ago

Description : Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy’s HTTP `path` request matcher is intended to be case-insensitive, but when the match pattern contains percent-escape sequences (`%xx`) it compares against the request’s escaped path without lowercasing. An attacker can bypass path-based routing and any access controls attached to that route by changing the casing of the request path. Version 2.11.1 contains a fix for the issue.

Severity: 0.0 | NA

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