Buffer Overrun in CGI.escape_html

A security vulnerability that causes buffer overflow when you pass a very large
string (> 700 MB) to CGI.escape_html on a platform where long type takes 4 bytes,
typically, Windows.

Please update the cgi gem to version 0.3.1, 0.2.1, and 0.1.1 or later. You can use
gem update cgi to update it. If you are using bundler, please add gem "cgi", ">= 0.3.1" to your Gemfile. Alternatively, please update Ruby to 2.7.5 or 3.0.3.

This issue has been introduced since Ruby 2.7, so the cgi version bundled with Ruby
2.6 is not vulnerable.