CVE-2026-45062: PHP Frankenphp

High severity, CVSS 8.1. EPSS: 0.8% chance of exploitation in the next 30 days.

FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.

Affected products

• PHP Frankenphp: from 1.11.2, before 1.12.3 (fixed in 1.12.3)

Published 2026-06-10. Last modified 2026-06-17.