About the security content of Safari 11.1 - Apple Support

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Safari 11.1

Released April 24, 2018

WebKit

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.4

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: A memory corruption issue was addressed with improved state management.

CVE-2018-4200: Ivan Fratric of Google Project Zero

WebKit

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.4

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

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

CVE-2018-4204: Richard Zhu (fluorescence) working with Trend Micro’s Zero Day Initiative, found by OSS-Fuzz

To check the version of Safari installed on your Mac:

1. Open Safari.
2. Choose Safari > About Safari.
3. If the latest version of Safari 11.1 is installed, you see:
   Version 11.1 (11605.1.33.1.4) on OS X El Capitan 10.11.6
   Version 11.1 (12605.1.33.1.4) on macOS Sierra 10.12.6
   Version 11.1 (13605.1.33.1.4) on macOS High Sierra 10.13.4

Safari 11.1 (v. 11605.1.33.1.4, 12605.1.33.1.4, and 13605.1.33.1.4) includes the security content of Safari 11.1.