Stable

macOS Sequoia 15.7.3

Security Update with Important Patches

Build Number 24G419

Release Date December 12, 2025

Download Size Security Update (varies by Mac)

Type Security Update

What's New in macOS Sequoia 15.7.3

macOS Sequoia 15.7.3 is a focused security update that addresses 25 vulnerabilities across various system components. This update is part of a coordinated security release affecting all Apple platforms and is recommended for all macOS Sequoia users to maintain system security and stability.

Security Fixes (25 vulnerabilities addressed)

WebKit Vulnerabilities: Critical security issues in the web rendering engine that could lead to arbitrary code execution
Permissions Issues: Fixed multiple permission-related vulnerabilities that could allow unauthorized access
Memory Corruption: Addressed memory corruption issues that could be exploited by malicious applications
Logic Issues: Resolved logic flaws in various system components
Privacy Enhancements: Improved privacy protections across system services
Kernel Security: Patches for kernel-level vulnerabilities

Safari 18.2.3

This update includes Safari 18.2.3 with important security improvements and bug fixes.

Important Notes

This update focuses exclusively on security and stability improvements
No new features or user-facing changes are included
Released simultaneously with macOS Tahoe 26.2 and macOS Sonoma 14.8.3
Apple recommends all Sequoia users install this update promptly
Compatible with all Macs running macOS Sequoia 15.x

Security Notice: This update addresses important security vulnerabilities. Apple recommends installing it as soon as possible to protect your Mac.

System Requirements

macOS Sequoia 15.7.3 maintains the same system requirements as macOS Sequoia 15.0:

Compatible Mac Models

iMac: 2019 and later
iMac Pro: 2017 and later
MacBook Air: 2020 and later
MacBook Pro: 2018 and later
Mac Pro: 2019 and later
Mac Studio: All models (2022 and later)
Mac mini: 2018 and later

Note: This includes both Intel-based and Apple Silicon Macs from the years mentioned above.

How to Update

Back up your Mac using Time Machine or your preferred backup method
Open System Settings from the Apple menu
Click on "General" in the sidebar
Select "Software Update"
Click "Update Now" when macOS Sequoia 15.7.3 appears
Enter your administrator password if prompted
Follow the on-screen instructions
Your Mac will restart to complete the installation

Tip: Security updates typically install quickly (10-20 minutes) and require one system restart.

Known Issues

As of the release date, no significant known issues have been reported with macOS Sequoia 15.7.3. This update has been thoroughly tested and is recommended for all Sequoia users.

If you experience any issues after updating:

Restart your Mac to clear any temporary glitches
Check that third-party apps are up to date
Visit our troubleshooting guide for solutions to common problems

Related Updates

The following updates were released simultaneously on December 12, 2025:

macOS Tahoe 26.2 - Security update for Tahoe users
macOS Sonoma 14.8.3 - Security update for Sonoma users
iOS 18.7.3 and iPadOS 18.7.3 - Mobile security updates
watchOS 11.7.3 - Apple Watch security update
tvOS 18.7.3 - Apple TV security update
Safari 18.2.3 - Standalone Safari update for older macOS versions

For detailed security information, visit Apple's security content page for macOS Sequoia 15.7.3.