Versions of PHP 5.3 earlier than 5.3.6 are potentially affected by multiple vulnerabilities :
Binary data 5824.prm
bugs.php.net/bug.php?id=53885
bugs.php.net/bug.php?id=54055
bugs.php.net/bug.php?id=54193
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0421
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0708
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1092
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1153
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1466
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1467
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1468
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1469
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1470
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1471
www.php.net/releases/5_3_6.php
www.rooibo.com/2011/03/12/integer-overflow-en-php-2