Use-after-free vulnerability in ext/spl/spl_array.c in the SPL component in PHP through 5.5.14 allows context-dependent attackers to cause a denial of service or possibly have unspecified other impact via crafted ArrayIterator usage within applications in certain web-hosting environments.
https://support.apple.com/HT204659
https://bugs.php.net/bug.php?id=67539
http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
http://www-01.ibm.com/support/docview.wss?uid=swg21683486
http://rhn.redhat.com/errata/RHSA-2014-1766.html
http://rhn.redhat.com/errata/RHSA-2014-1765.html
http://rhn.redhat.com/errata/RHSA-2014-1327.html
http://rhn.redhat.com/errata/RHSA-2014-1326.html
http://lists.opensuse.org/opensuse-updates/2014-09/msg00046.html
http://lists.opensuse.org/opensuse-updates/2014-07/msg00035.html
http://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html