As applicable for their environment, corporate DBAs and system administrations should download, pilot test, and then install these critical security updates to better protect Oracle based applications.
QUOTE: The Critical Patch Update for July 2008 was released on July 15, 2008. Oracle strongly recommends applying the patches as soon as possible.
Oracle Security Update for July 2008
http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpujul2008.html