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

RHSA-2004:650-01 Updated libxml package fixes security vulnerabilities

Files available: libxml-1.8.14-3.i386.rpm libxml-devel-1.8.14-3.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