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Ruby 4.0.3 has been released to address a critical security vulnerability (CVE-2026-41316) in ERB involving unsafe deserialization. The flaw allows arbitrary code execution when Marshal.load is used on untrusted data, as three ERB methods (def_method, def_module, def_class) bypass the @_init guard. Most Ruby on Rails applications using Marshal for caching, sessions, or IPC are affected. The fix is to upgrade to ERB 6.0.1.1+ via Ruby 4.0.3 and avoid using Marshal.load with untrusted input, preferring JSON instead.