From: Apple Product Security
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APPLE-SA-2016-03-21-6 Safari 9.1

Safari 9.1 is now available and addresses the following:

libxml2
Available for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,
OS X El Capitan v10.11 to v10.11.3
Impact:  Processing maliciously crafted XML may lead to unexpected [...]