CVE-2012-2140
The Mail gem before 2.4.3 for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in a (1) sendmail or (2) exim delivery.
Date published : 2012-07-18
https://github.com/mikel/mail/blob/9beb079c70d236a5ad2e1ba95b2c977e55deb7af/CHANGELOG.rdoc
https://github.com/mikel/mail/commit/39b590ddb08f90ddbe445837359a2c8843e533d0