Cheetah is a Python powered template engine and code generator.
Brian Bird discovered that Cheetah searches for modules in the world-writable /tmp directory.
A malicious local user could place a module containing arbitrary code in /tmp, which when imported would run with escalated privileges.
There are no known workarounds at this time.
All Cheetah users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-python/cheetah-0.9.17_rc1"