The php_handler function in sapi/apache2handler/sapi_apache2.c in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8, when the Apache HTTP Server 2.4.x is used, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via pipelined HTTP requests that result in a "deconfigured interpreter."
https://support.apple.com/kb/HT205031
https://support.apple.com/HT205267
https://security.gentoo.org/glsa/201606-10
https://bugs.php.net/bug.php?id=68486
http://www.ubuntu.com/usn/USN-2572-1
http://www.securitytracker.com/id/1033703
http://www.securityfocus.com/bid/74204
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
http://rhn.redhat.com/errata/RHSA-2015-1187.html
http://rhn.redhat.com/errata/RHSA-2015-1186.html
http://rhn.redhat.com/errata/RHSA-2015-1135.html
http://rhn.redhat.com/errata/RHSA-2015-1066.html
http://php.net/ChangeLog-5.php
http://openwall.com/lists/oss-security/2015/04/17/7
http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00004.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=809610f5ea38a83b284e1125d1fff129bdd615e7