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

RHBA-2006:0502-2 bash bug fix update

Files available: bash-2.05-8.7.i386.rpm bash-doc-2.05-8.7.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