The best browser for your Mac is the one that comes with your Mac. Safari is faster and more energy efficient than other browsers, so sites are more responsive and your notebook battery lasts longer between charges. Built-in privacy features help keep your browsing your business. Handy tools help you save, find, and share your favorites. And Safari works with iCloud to let you browse seamlessly across all your devices.

New in this version:
Safari:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Visiting a malicious website may lead to address bar spoofing
Description: An inconsistent user interface issue was addressed with improved state management.
CVE-2018-4279: Ruilin Yang, Xu Taoyu (xia0yu.win)

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash
Description: A memory corruption issue was addressed with improved memory handling.
CVE-2018-4270: found by OSS-Fuzz

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: A malicious website may exfiltrate audio data cross-origin
Description: Sound fetched through audio elements may be exfiltrated cross-origin. This issue was addressed with improved audio taint tracking.
CVE-2018-4278: Jun Kokatsu (@shhnjk)

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Processing maliciously crafted web content may lead to arbitrary code execution
Description: A type confusion issue was addressed with improved memory handling.
CVE-2018-4284: Found by OSS-Fuzz

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: A malicious website may be able to cause a denial of service
Description: A race condition was addressed with additional validation.
CVE-2018-4266: found by OSS-Fuzz

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Processing maliciously crafted web content may lead to arbitrary code execution
Description: Multiple memory corruption issues were addressed with improved memory handling.
CVE-2018-4261: Omair working with Trend Micro's Zero Day Initiative
CVE-2018-4262: Mateusz Krzywicki working with Trend Micro's Zero Day Initiative
CVE-2018-4263: Arayz working with Trend Micro's Zero Day Initiative
CVE-2018-4264: found by OSS-Fuzz, Yu Zhou and Jundong Xie of Ant-financial Light-Year Security Lab
CVE-2018-4265: cc working with Trend Micro's Zero Day Initiative
CVE-2018-4267: Arayz of Pangu team working with Trend Micro's Zero Day Initiative
CVE-2018-4272: found by OSS-Fuzz

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash
Description: Multiple memory corruption issues were addressed with improved input validation.
CVE-2018-4271: found by OSS-Fuzz
CVE-2018-4273: found by OSS-Fuzz

WebKit:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Visiting a malicious website may lead to address bar spoofing
Description: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.
CVE-2018-4274: an anonymous researcher

WebKit Page Loading:
Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6
Impact: Visiting a malicious website may lead to address bar spoofing
Description: An inconsistent user interface issue was addressed with improved state management.
CVE-2018-4260: xisigr of Tencent's Xuanwu Lab (tencent.com)

Requirements:
OS X 10.11.6+
64-bit Intel