The xz_decomp function in xzlib.c in libxml2 2.9.1 does not properly detect compression errors, which allows context-dependent attackers to cause a denial of service (process hang) via crafted XML data.
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http://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html
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http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html