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

RHSA-2007:0513-01 Moderate: gimp security update

Files available:
gimp-1.2.1-7.8.el2_1.i386.rpm
gimp-devel-1.2.1-7.8.el2_1.i386.rpm
gimp-perl-1.2.1-7.8.el2_1.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