Apple has released Safari 10.0.3 for OS X 10.10.5 Yosemite and 10.11.6 El Capitan (macOS 10.12.3 Sierra also includes it; see “Apple Releases macOS Sierra 10.12.3, iOS 10.2.1, tvOS 10.1.1, and watchOS 3.1.1,” 23 January 2017) with patches for WebKit-related security vulnerabilities. The update deals with multiple memory corruption issues that could allow arbitrary code execution after processing maliciously crafted Web content, plus a state management issue that could lead to address bar spoofing. Safari 10.0.3 is available only via Software Update. (Free, release notes, 10.10+)
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