CentOS Errata and Security Advisory 2009:0214
https://rhn.redhat.com/errata/RHSA-2008-0214.html
The following updated files have been uploaded and are currently syncing to the mirrors:
i386: squid-2.5.STABLE14-1.4E.el4_6.2.i386.rpm
src: squid-2.5.STABLE14-1.4E.el4_6.2.src.rpm