Safari 26.3 Security Update

What Safari 26.3 Fixes

Safari 26.3, released February 11, 2026, fixes 8 vulnerabilities in 3 parts of the system, according to Apple's security advisory.

Apple does not say that any of them were exploited before the fix. That makes Safari 26.3 a routine security update: worth installing soon, not an emergency.

It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.

Grouped by us from the impact Apple gives for each fix; the impact lines below are Apple's own.

Which Devices Get Safari 26.3

Apple lists Safari 26.3 for: macOS Sonoma and macOS Sequoia.

How to Install Safari 26.3

Safari updates arrive through Software Update on the Mac. On a current macOS they are part of the macOS update; on older versions they are offered separately.

Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past Safari 26.3 there is nothing to do.

Every Fix in Safari 26.3

All 8 CVEs in Apple's advisory, the most serious kinds first. Each entry is the part of the system affected, Apple's description of the impact and the fix, and the CVE ID.

• WebKit

  A website may be able to track users through Safari web extensions

  This issue was addressed through improved state management.

  CVE-2026-20676

• WebKit

  A remote attacker may be able to cause a denial-of-service

  The issue was addressed with improved memory handling.

  CVE-2026-20652

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process crash

  This issue was addressed through improved state management.

  CVE-2026-20608

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process crash

  The issue was addressed with improved memory handling.

  CVE-2026-20644 CVE-2026-20636 CVE-2026-20635

• CFNetwork

  A remote user may be able to write arbitrary files

  A path handling issue was addressed with improved logic.

  CVE-2026-20660

• Safari

  An app may be able to access a user's Safari history

  A logic issue was addressed with improved validation.

  CVE-2026-20656

Safari Security Release History

Safari 26.3 in context: the security releases Apple has published for Safari, newest first, with the number of fixes each carried.

The Same Fixes Elsewhere

Apple ships most fixes to every platform that shares the code, and to older versions still under support. These releases close at least one of the same CVEs:

Frequently Asked Questions