The following errata for CentOS-2 have been built and uploaded to the centos mirror:

RHSA-2006:0720-01 Critical: kdelibs security update

Files available:
arts-2.2.2-21.EL2.i386.rpm
kdelibs-2.2.2-21.EL2.i386.rpm
kdelibs-devel-2.2.2-21.EL2.i386.rpm
kdelibs-sound-2.2.2-21.EL2.i386.rpm
kdelibs-sound-devel-2.2.2-21.EL2.i386.rpm

More details are available from the RedHat web site at
https://rhn.redhat.com/errata/rh21as-errata.html

The easy way to make sure you are up to date with all the latest patches is to run:
# yum update