The following errata for CentOS-2 have been built and uploaded to the centos mirror:
RHSA-2007:0731-01 Important: tetex security update
Files available: tetex-1.0.7-38.5E.11.i386.rpm tetex-afm-1.0.7-38.5E.11.i386.rpm tetex-doc-1.0.7-38.5E.11.i386.rpm tetex-dvilj-1.0.7-38.5E.11.i386.rpm tetex-dvips-1.0.7-38.5E.11.i386.rpm tetex-fonts-1.0.7-38.5E.11.i386.rpm tetex-latex-1.0.7-38.5E.11.i386.rpm tetex-xdvi-1.0.7-38.5E.11.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