The i_zval_ptr_dtor function in Zend/zend_variables.h in PHP 7.1.5 allows attackers to cause a denial of service (memory consumption and application crash) or possibly have unspecified other impact by triggering crafted operations on array data structures. Upstream bug: https://bugs.php.net/bug.php?id=74593
Created php tracking bugs for this issue: Affects: fedora-all [bug 1456751]
Analysis: This seems to be more like a memory exhaustion which is caused by malicious PHP script. I dont see this as being triggerable by a malicious PHP application user.