macOS Image Processing Memory Corruption (CVE-2025-4326

Vendor-confirmed - CVE-2025-43264 is a high memory handling vulnerability in macOS prior to 15.6 that lets an attacker execute arbitrary code via a malicious image file exploiting user interaction. Patch to Sequoia 15.6 or later to mitigate remote code execution risk.

Overview

A high-severity memory handling vulnerability, tracked as CVE-2025-43264, has been patched in macOS. The flaw exists in the operating system’s image processing components. By tricking a user into opening a specially crafted malicious image file, an attacker could corrupt the memory of the affected application, potentially leading to arbitrary code execution.

Impact and Attack Vector

This vulnerability carries a CVSS score of 8.8 (HIGH). It is network-accessible, requiring no privileges to exploit, but does require user interaction. The most likely attack scenario involves an attacker hosting a malicious image on a website or delivering it via email or messaging apps. When a user views or processes this image with a vulnerable macOS application, it triggers the memory corruption. Successful exploitation could allow an attacker to execute code on the victim’s system with the privileges of the current user, leading to data theft, malware installation, or system compromise. The broad attack surface of image processing makes this a significant threat.

Affected Systems and Remediation

The vulnerability affects macOS versions prior to Sequoia 15.6. Apple has addressed the issue with improved memory handling in the latest update.

Action Required:

1. Immediate Patching: All macOS users should update their systems to macOS Sequoia 15.6 or later immediately. Updates are delivered via System Settings > Software Update.
2. Verification: Verify the installed macOS version by clicking the Apple menu > About This Mac. The version should be 15.6 or higher.
3. Defense-in-Depth: As a general security practice, users should exercise caution when opening image files from untrusted sources, even while patched. This incident follows a pattern of memory safety issues in widely used software, such as a recent WebKit vulnerability enabling same-origin policy bypass.

There are no known workarounds for unpatched systems; applying the official update is the only complete mitigation.

Security Insight

This memory corruption flaw is a classic example of the persistent software security challenge posed by improper memory handling, a common root cause in many high-severity vulnerabilities. Its emergence in a core system component like image processing underscores the critical importance of robust memory safety practices within foundational OS code. The rapid patch cycle from Apple highlights a responsive security posture, but it also serves as a reminder of the sophisticated techniques attackers use, similar to those seen in campaigns involving malicious packages deploying macOS stealers, where initial access is often gained through user interaction with seemingly benign files.

Further Reading

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