The PDO adapters in Zend Framework before 1.12.16 do not filer null bytes in SQL statements, which allows remote attackers to execute arbitrary SQL commands via a crafted query.
http://www.securityfocus.com/bid/76784
http://www.openwall.com/lists/oss-security/2015/10/11/3
http://www.openwall.com/lists/oss-security/2015/09/30/8
http://www.openwall.com/lists/oss-security/2015/09/30/6