CVE-2026-37552

Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The sync-invoke TCP server (Server.php:87) receives data from a TCP socket, passes it directly to Opis\Closure\unserialize(), then executes the result via call_user_func(). No authentication or signature verification exists on the TCP connection. An attacker with access to the localhost TCP port (server binds 127.0.0.1) can send a crafted serialized PHP closure to achieve arbitrary code execution.

• https://gist.github.com/sgInnora/fa46386840fe978a30d7e53c458f2975
• https://github.com/mix-php/mix
• https://github.com/mix-php/mix/blob/v2.2.17/src/sync-invoke/src/Server.php