An issue was discovered in RubyGems 2.6 and later through 3.0.2. Gem::GemcutterUtilities#with_response may output the API response to stdout as it is. Therefore, if the API side modifies the response, escape sequence injection may occur.
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-2019-8323.yml
hackerone.com/reports/315081
lists.debian.org/debian-lts-announce/2020/08/msg00027.html
nvd.nist.gov/vuln/detail/CVE-2019-8323