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

RHEA-2006:0208-7 glibc enhancement update

Files available:
glibc-2.2.4-32.23.i386.rpm
glibc-common-2.2.4-32.23.i386.rpm
glibc-devel-2.2.4-32.23.i386.rpm
glibc-profile-2.2.4-32.23.i386.rpm
nscd-2.2.4-32.23.i386.rpm
glibc-2.2.4-32.23.i686.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