ALPINE-CVE-2026-27590
- Source
- https://security.alpinelinux.org/vuln/CVE-2026-27590
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-27590.json
- JSON Data
- https://api.osv.dev/v1/vulns/ALPINE-CVE-2026-27590
- Upstream
- Published
- 2026-02-24T17:29:04Z
- Modified
- 2026-11-03T06:33:02Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because
strings.ToLower()can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrectSCRIPT_NAME/SCRIPT_FILENAMEandPATH_INFO, potentially causing a request that contains.phpto execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue. - References