Archive::Tar::Minitar is a pure-Ruby library and command-line utility that provides the ability to deal with POSIX tar(1) archive files.
Michal Marek discovered that Ruby Archive::Tar::Minitar is vulnerable to a directory traversal vulnerability.
A remote attacker could entice a user or an automated system to process a specially crafted archive using Ruby Archive::Tar::Minitar possibly allowing the writing of arbitrary files with the privileges of the process.
There is no known workaround at this time.
All Ruby Archive::Tar::Minitar users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose
">=dev-ruby/archive-tar-minitar-0.6.1"