The htmlParseNameComplex function in HTMLparser.c in libxml2 allows attackers to cause a denial of service (out-of-bounds read) via a crafted XML document.
www.openwall.com/lists/oss-security/2016/01/25/6
www.openwall.com/lists/oss-security/2016/01/26/7
www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
www.securityfocus.com/bid/85267
www.securitytracker.com/id/1035011
www.ubuntu.com/usn/USN-2994-1
security.gentoo.org/glsa/201701-37
www.debian.org/security/2016/dsa-3593