The xmlParseElementDecl function in parser.c in libxml2 before 2.9.4 allows context-dependent attackers to cause a denial of service (heap-based buffer underread and application crash) via a crafted file, involving xmlParseName.
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support.apple.com/HT206904
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www.debian.org/security/2016/dsa-3593
www.tenable.com/security/tns-2016-18