The phar_make_dirstream function in ext/phar/dirstream.c in PHP before 5.6.18 and 7.x before 7.0.3 mishandles zero-size ././@LongLink files, which allows remote attackers to cause a denial of service (uninitialized pointer dereference) or possibly have unspecified other impact via a crafted TAR archive.
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
http://www.securityfocus.com/bid/89179
http://www.openwall.com/lists/oss-security/2016/04/28/2
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://php.net/ChangeLog-7.php
http://php.net/ChangeLog-5.php
http://lists.opensuse.org/opensuse-updates/2016-05/msg00086.html