php: libxml_disable_entity_loader setting is shared between threads

ext/libxml/libxml.c in PHP before 5.5.22 and 5.6.x before 5.6.6, when PHP-FPM is used, does not isolate each thread from libxmldisableentityloader changes in other threads, which allows remote attackers to conduct XML External Entity XXE and XML Entity Expansion XEE attacks via a crafted XML...