Zend Framework 1 (ZF1) before 1.12.4 Zend Framework 2 before 2.1.6 and 2.2.x before 2.2.6 ZendOpenId ZendRest ZendService_AudioScrobbler ZendService_Nirvanix ZendService_SlideShare ZendService_Technorati and ZendService_WindowsAzure before 2.0.2 ZendService_Amazon before 2.0.3 and ZendService_Api before 1.0.0 allow remote attackers to cause a denial of service (CPU consumption) via (1) recursive or (2) circular references in an XML entity definition in an XML DOCTYPE declaration aka an XML Entity Expansion (XEE) attack. NOTE: this issue exists because of an incomplete fix for CVE-2012-6532.