Bug 2442398 (CVE-2026-27587) - CVE-2026-27587 github.com/caddyserver/caddy/v2/modules/caddyhttp: Caddy: Access control bypass due to improper handling of percent-escape sequences in HTTP path matcher
Summary: CVE-2026-27587 github.com/caddyserver/caddy/v2/modules/caddyhttp: Caddy: Acce...
Keywords:
Status: NEW
Alias: CVE-2026-27587
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On: 2442422
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-24 17:04 UTC by OSIDB Bzimport
Modified: 2026-02-24 18:45 UTC (History)
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Description OSIDB Bzimport 2026-02-24 17:04:00 UTC 
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.
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