Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.
https://huntr.dev/bounties/9fcc06d0-08e4-49c8-afda-2cae40946abe
https://github.com/mruby/mruby/commit/3cf291f72224715942beaf8553e42ba8891ab3c6