More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2336100 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
It does not look Ruby developers would be open to address this issue on Ruby side, claiming this would be fix on wrong layer.