An integer overflow vulnerability identified as CVE-2026-43769 was mitigated by Apple through improved input validation. The vulnerability could be exploited by an application to cause unexpected system termination, impacting system availability. The issue affects multiple Apple operating systems and has been addressed in the respective OS versions listed. The CVSS v3.1 score is 9.8 (critical), indicating high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. The vulnerability is classified under CWE-190 (Integer Overflow or Wraparound).

Successful exploitation of this integer overflow vulnerability may allow an application to cause unexpected system termination, resulting in denial of service. The CVSS score of 9.8 reflects a critical impact on confidentiality, integrity, and availability, meaning the vulnerability could lead to severe system disruption.

This vulnerability has been fixed by Apple in iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6. Users and administrators should apply these official updates to remediate the issue. No additional mitigation is required beyond applying the vendor's official patches.