CentOS Errata and Security Advisory 2007:0074
https://rhn.redhat.com/errata/RHSA-2007-0074.html
The following updated files have been uploaded and are currently syncing to the mirrors:
x86_64: spamassassin-3.1.8-2.el4.x86_64.rpm
src: spamassassin-3.1.8-2.el4.src.rpm