The xmlSAX2TextNode function in SAX2.c in the push interface in the HTML parser in libxml2 before 2.9.3 allows context-dependent attackers to cause a denial of service (stack-based buffer over-read and application crash) or obtain sensitive information via crafted XML data.
https://support.apple.com/HT206169
https://support.apple.com/HT206168
https://support.apple.com/HT206167
https://support.apple.com/HT206166
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https://bugzilla.redhat.com/show_bug.cgi?id=1281950
https://bugzilla.gnome.org/show_bug.cgi?id=756372
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http://www.securitytracker.com/id/1034243
http://www.securityfocus.com/bid/77681
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http://www.openwall.com/lists/oss-security/2015/11/18/23
http://www.openwall.com/lists/oss-security/2015/11/17/5
http://rhn.redhat.com/errata/RHSA-2016-1089.html
http://rhn.redhat.com/errata/RHSA-2015-2550.html
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http://marc.info/?l=bugtraq&m=145382616617563&w=2
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http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html