Mutt is a small but very powerful text-based mail client.
A memory leak could occur when a crafted email message is received.
An attacker could cause a possible Denial of Service condition.
There is no known workaround at this time.
All Mutt users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-client/mutt-2.0.4-r1"