CVE-2026-74899 [CRITICAL] – openssl_encrypt versions before 1.4.0 contain a sandbox escape vulnerability in IsolatedPl

openssl_encrypt versions before 1.4.0 contain a sandbox escape vulnerability in IsolatedPluginExecutor that exposes Python type objects in restricted exec() builtins. Attackers can traverse the Python class hierarchy via __class__.__mro__.__subclasses__() to access system functions and execute arbitrary OS commands.