The phar_get_entry_data function in ext/phar/util.c in PHP before 5.5.30 and 5.6.x before 5.6.14 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a .phar file with a crafted TAR archive entry in which the Link indicator references a file that does not exist.
http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=d698f0ae51f67c9cce870b09c59df3d6ba959244
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00052.html
http://lists.opensuse.org/opensuse-updates/2016-01/msg00099.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00037.html
https://bugs.php.net/bug.php?id=69720
https://security.gentoo.org/glsa/201606-10
https://support.apple.com/HT205637
http://www.debian.org/security/2015/dsa-3380
http://www.openwall.com/lists/oss-security/2015/10/05/8