The strong_password gem 0.0.7 for Ruby, as distributed on RubyGems.org, included a code-execution backdoor inserted by a third party. Version 0.0.8 does not contain the backdoor.
benjamin-bouchet.com/blog/vulnerabilite-dans-la-gem-strong_password-0-0-7
github.com/bdmac/strong_password
github.com/bdmac/strong_password/releases
github.com/rubysec/ruby-advisory-db/blob/master/gems/strong_password/CVE-2019-13354.yml
nvd.nist.gov/vuln/detail/CVE-2019-13354
rubygems.org/gems/strong_password/versions
withatwist.dev/strong-password-rubygem-hijacked.html