Use-after-free vulnerability in the add_post_var function in the Posthandler component in PHP 5.6.x before 5.6.1 might allow remote attackers to execute arbitrary code by leveraging a third-party filter extension that accesses a certain ksep value.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-3584
https://bugzilla.redhat.com/show_bug.cgi?id=1151423