About the security content of Safari 9.1.3 - Apple Support

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Safari 9.1.3

Released September 1, 2016

WebKit

Available for: OS X Mavericks v10.9.5 and OS X Yosemite v10.10.5

Impact: Visiting a maliciously crafted website may lead to arbitrary code execution

Description: A memory corruption issue was addressed through improved memory handling.

CVE-2016-4657: Citizen Lab and Lookout