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

RHSA-2008:0287-01 Important: libxslt security update

Files available:
libxslt-1.0.15-3.i386.rpm
libxslt-devel-1.0.15-3.i386.rpm
libxslt-python-1.0.15-3.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


CESA-2008:0270 Important CentOS 5 x86_64 libvorbis Update
RHSA-2008:0270-01 Important: libvorbis security update