CVE-2026-27587
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.
- Score
- CVSS 3.1 9.1 Critical
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-02-24
- Last modified
- 2026-02-27
- Weaknesses
- CWE-178
Affected products
References
- https://github.com/caddyserver/caddy/releases/tag/v2.11.1
- https://github.com/caddyserver/caddy/security/advisories/GHSA-g7pc-pc7g-h8jh
