Safari 17.5 Security Update

What Safari 17.5 Fixes

Safari 17.5, released May 13, 2024, fixes 10 vulnerabilities in 4 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 17.5 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It has since been superseded: the newest security release for Safari is Safari 27.2, from October 26, 2026, which includes these fixes.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 17.5

Apple lists Safari 17.5 for: macOS Monterey and macOS Ventura.

How to Install Safari 17.5

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 17.5 there is nothing to do.

Every Fix in Safari 17.5

All 10 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

  Processing a file may lead to unexpected app termination or arbitrary code execution

  The issue was addressed with improved checks.

  CVE-2024-27856

• WebKit

  Processing web content may lead to arbitrary code execution

  The issue was addressed with improved memory handling.

  CVE-2024-27808

• WebKit

  Processing maliciously crafted web content may lead to arbitrary code execution

  An integer overflow was addressed with improved input validation.

  CVE-2024-27833

• WebKit

  Processing maliciously crafted web content may lead to arbitrary code execution

  The issue was addressed with improved bounds checks.

  CVE-2024-27851

• WebKit Web Inspector

  Processing web content may lead to arbitrary code execution

  The issue was addressed with improved memory handling.

  CVE-2024-27820

• WebKit

  An attacker with arbitrary read and write capability may be able to bypass Pointer Authentication

  The issue was addressed with improved checks.

  CVE-2024-27834

• Safari

  A website's permission dialog may persist after navigation away from the site

  The issue was addressed with improved checks.

  CVE-2024-27844

• WebKit

  A maliciously crafted webpage may be able to fingerprint the user

  The issue was addressed by adding additional logic.

  CVE-2024-27838

• WebKit

  A maliciously crafted webpage may be able to fingerprint the user

  This issue was addressed with improvements to the noise injection algorithm.

  CVE-2024-27850

• WebKit Canvas

  A maliciously crafted webpage may be able to fingerprint the user

  This issue was addressed through improved state management.

  CVE-2024-27830

Safari Security Release History

Safari 17.5 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