CVE-2018-12247
An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).
Date published : 2018-06-12
https://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2