In addition to other announcements, the folks behind PHP have released new versions in the 5.3 and 5.4 branches to address a couple of security issues.

5.3.13 addresses CVE-2012-2311 and 5.4.3 addresses both CVE-2012-2311 and CVE-2012-2329.

Details are available here: http://www.php.net/archive/2012.php#id2012-05-08-1