The xmlStringLenDecodeEntities function in parser.c in libxml2 before 2.9.3 does not properly prevent entity expansion, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted XML data, a different vulnerability than CVE-2014-3660.
https://support.apple.com/HT206169
https://support.apple.com/HT206168
https://support.apple.com/HT206167
https://support.apple.com/HT206166
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http://www.securityfocus.com/bid/79536
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http://rhn.redhat.com/errata/RHSA-2015-2550.html
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http://marc.info/?l=bugtraq&m=145382616617563&w=2
http://lists.opensuse.org/opensuse-updates/2016-01/msg00031.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00120.html
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http://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html