From: Apple Product Security
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APPLE-SA-2015-10-21-3 Safari 9.0.1

Safari 9.0.1 is now available and addresses the following:

WebKit
Available for:  OS X Mavericks v10.9.5, OS X Yosemite v10.10.5,
and OS X El Capitan v10.11
Impact:  Visiting a maliciously crafted website may lead to arbitrary
code execution [...]