CVE-2026-27587 — Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass
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 ma…
Published: 2026-02-24 · CVSS: 7.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7