CVE-2026-27587
Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass
- State
- Published
- Severity
- 7.7 High
- Published
- Feb 24, 2026
- Updated
- Feb 27, 2026
- Reserved
- Feb 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P | GitHub_M |
Weaknesses
- CWE-178 Improper Handling of Case Sensitivity
Affected Products
| Product | Versions |
|---|---|
caddycaddyserver |
|
References
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