CentOS Errata and Security Advisory 2005:506
https://rhn.redhat.com/errata/RHSA-2005-506.html
The following updated files have been uploaded and are currently syncing to the mirrors for both CentOS 4.0 and 4.1:
i386: mikmod-3.1.6-32.EL4.i386.rpm mikmod-devel-3.1.6-32.EL4.i386.rpm
src: mikmod-3.1.6-32.EL4.src.rpm