An issue was discovered in RubyGems 2.6 and later through 3.0.2. Since Gem::CommandManager#run calls alert_error without escaping, escape sequence injection is possible. (There are many ways to cause an error.)
lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
blog.rubygems.org/2019/03/05/security-advisories-2019-03.html
github.com/rubysec/ruby-advisory-db/blob/master/gems/rubygems-update/CVE-2019-8325.yml
lists.debian.org/debian-lts-announce/2020/08/msg00027.html
nvd.nist.gov/vuln/detail/CVE-2019-8325