Improper Handling of Case Sensitivity Affecting github.com/caddyserver/caddy/v2/modules/caddyhttp package, versions <2.11.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCADDYSERVERCADDYV2MODULESCADDYHTTP-15346502
- published25 Feb 2026
- disclosed24 Feb 2026
- creditAsim Viladi Oglu Manizada
Introduced: 24 Feb 2026
CVE-2026-27587 Â (opens in a new tab)How to fix?
Upgrade github.com/caddyserver/caddy/v2/modules/caddyhttp to version 2.11.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity in the matchPatternWithEscapeSequence function when handling patterns containing percent-escape sequences. An attacker can gain unauthorized access to protected routes and sensitive endpoints by altering the case of characters in the request path, thereby bypassing intended access controls.