Most notably, this fixes a RCE that can be exploited by any MitM capable of poisoning a DNS response[1].<p>[1]: <a href="https://github.com/rubygems/rubygems/commit/8d91516fb7037ecfb27622f605dc40245e0f8d32" rel="nofollow">https://github.com/rubygems/rubygems/commit/8d91516fb7037ecf...</a>