JSON is a JSON implementation for Ruby. Starting in version 2.10.0 and prior to version 2.10.2, a specially crafted document could cause an out of bound read, most likely resulting in a crash. Versions prior to 2.10.0 are not vulnerable. Version 2.10.2 fixes the problem. No known workarounds are available.
https://github.com/ruby/json/security/advisories/GHSA-9m3q-rhmv-5q44
https://github.com/ruby/json/releases/tag/v2.10.2
https://github.com/ruby/json/commit/c56db31f800d5d508389793e69682f99749dbadf