CVE-2026-24895: php frankenphp

Vulnerability summary

CVE-2026-24895 is a critical (CVSS 9.8) vulnerability in php frankenphp. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 12-02-2026
   PublishedVulnerability first disclosed.
2. 12-02-2026
   Last modifiedVulnerability information updated.

Description

FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP’s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., Ⱥ expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2.

• CWE-180Incorrect Behavior Order: Validate Before CanonicalizeThe product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step.