About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
Released September 1, 2016
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