The phar_parse_metadata function in ext/phar/phar.c in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8 allows remote attackers to cause a denial of service (heap metadata corruption) or possibly have unspecified other impact via a crafted tar archive.
https://support.apple.com/kb/HT205031
https://bugs.php.net/bug.php?id=69443
http://www.securityfocus.com/bid/74703
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://rhn.redhat.com/errata/RHSA-2015-1218.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://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html