Muttprint formats the output of mail clients to a good-looking printing using LaTeX.
Dmitry E. Oboukhov reported an insecure usage of the temporary file "/tmp/muttprint.log" in the muttprint script.
A local attacker could perform symlink attacks to overwrite arbitrary files with the privileges of the user running the application.
There is no known workaround at this time.
All Muttprint users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/muttprint-0.72d-r1"