Introduction
Apple has released macOS Sequoia 15.6.1 on August 20, 2025, addressing a critical security vulnerability in the operating system. The update focuses on fixing a flaw in the ImageIO framework that could allow attackers to exploit macOS devices by sending malicious image files.
Details of the Security Fix
The primary issue resolved in macOS Sequoia 15.6.1 is an out-of-bounds write vulnerability in ImageIO. According to Apple, this bug could lead to memory corruption if a specially crafted image file is processed.
- CVE ID: CVE-2025-43300
- Severity: Critical
- Impact: May have been used in targeted attacks against specific individuals.
- Fix: Improved bounds checking to prevent memory corruption.
This patch emphasizes Apple’s ongoing focus on user protection, especially from sophisticated cyber threats.
Apple’s Security Approach
Apple maintains a strict policy of withholding detailed vulnerability information until updates are available. This approach helps minimize exploitation risks while security teams investigate and patch flaws. Users are strongly encouraged to update their macOS devices immediately to stay secure.
Why This Update Matters
The fact that Apple acknowledges this issue may have been actively exploited signals that it’s more than just a routine security patch. Attackers targeting high-profile individuals or organizations could use vulnerabilities like this for espionage or data theft. Keeping macOS devices up-to-date is crucial for cybersecurity resilience.
How to Update
Go to System Settings > General > Software Update.
Download the update and wait till installation begins automatically.
Restart your Mac after installation.
Install macOS Sequoia 15.6.1.
