CentOS Errata and Security Advisory 2008:0584
https://rhn.redhat.com/errata/RHSA-2008-0584.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: pidgin-1.5.1-2.el4.i386.rpm
src: pidgin-1.5.1-2.el4.src.rpm