CentOS Errata and Security Advisory 2007:0386
https://rhn.redhat.com/errata/RHSA-2007-0386.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/mutt-1.4.1-12.0.3.el4.s390.rpm
s390x: updates/s390x/RPMS/mutt-1.4.1-12.0.3.el4.s390x.rpm