CentOS Errata and Security Advisory 2007:0018
https://rhn.redhat.com/errata/RHSA-2007-0018.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: fetchmail-6.2.5-6.el4.5.i386.rpm
src: fetchmail-6.2.5-6.el4.5.src.rpm