CVE-2026-27587

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.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-24 | Updated 2026-02-24 | Assigner GitHub_M

Problem types

CWE-178: Improper Handling of Case Sensitivity

Product status

References

github.com/.../caddy/security/advisories/GHSA-g7pc-pc7g-h8jh

github.com/caddyserver/caddy/releases/tag/v2.11.1

cve.org (CVE-2026-27587)

nvd.nist.gov (CVE-2026-27587)

Download JSON