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critical advisory

ERB Deserialization Bypass via def_module/def_method/def_class

A deserialization vulnerability exists in Ruby ERB versions before 4.0.3.1, version 4.0.4, ERB versions 5.0.0 before 6.0.1.1, and ERB versions 6.0.2 before 6.0.4. The `@_init` instance variable guard in `ERB#result` and `ERB#run` can be bypassed via `ERB#def_module`, `ERB#def_method`, and `ERB#def_class`, allowing arbitrary code execution when an ERB object is reconstructed via `Marshal.load` on untrusted data.

ERB deserialization rce ruby rails
2r 2t 1c