CVE-2026-64774: 
macOS vulnerability analysis and mitigation

CVE-2026-64774 is an integer overflow vulnerability in Apple's Model I/O framework that allows a remote attacker to cause unexpected application termination or heap corruption. It was disclosed and patched on July 27, 2026, as part of Apple's coordinated security update across multiple operating systems. Affected versions include iOS and iPadOS prior to 26.6, macOS Sonoma prior to 14.8.8, macOS Sequoia prior to 15.7.8, macOS Tahoe prior to 26.6, tvOS prior to 26.6, and visionOS prior to 26.6. The vulnerability was discovered by researcher stratan (@5tratan) and is estimated as HIGH severity; a formal CVSS score has not yet been published (Apple iOS/iPadOS Advisory, Apple macOS Tahoe Advisory, Apple tvOS Advisory, Apple visionOS Advisory, Apple macOS Sequoia Advisory).

The vulnerability is classified as an integer overflow (CWE-190) in Apple's Model I/O framework, which is responsible for importing, exporting, and manipulating 3D model and scene data. Insufficient input validation during the processing of maliciously crafted model or image files allows arithmetic overflow conditions that can corrupt heap memory or trigger application termination. The attack vector is network-accessible and requires no authentication or user interaction beyond delivering a crafted file to a vulnerable application that uses Model I/O for parsing. The fix involved improved input validation to prevent the overflow condition (Apple iOS/iPadOS Advisory, Apple macOS Sequoia Advisory).

Successful exploitation can result in unexpected application termination (denial of service) or heap memory corruption in the context of the affected application. Heap corruption may, in some scenarios, be leveraged for further memory exploitation primitives, though Apple's advisory characterizes the primary impact as application termination or heap corruption rather than confirmed arbitrary code execution. The vulnerability affects a broad range of Apple platforms — iPhone, iPad, Mac, Apple TV, and Apple Vision Pro — expanding the potential attack surface to consumer and enterprise devices alike (Apple iOS/iPadOS Advisory, Apple tvOS Advisory, Apple visionOS Advisory).

Apple has released patches addressing this vulnerability across all affected platforms. Users should update to the following versions or later: iOS 26.6 and iPadOS 26.6 (iPhone 11 and later, supported iPad models), macOS Sonoma 14.8.8, macOS Sequoia 15.7.8, macOS Tahoe 26.6, tvOS 26.6, and visionOS 26.6. No configuration-based workarounds are available; applying the security update is the only recommended remediation. Updates can be applied via System Settings > Software Update on macOS, or Settings > General > Software Update on iOS/iPadOS (Apple iOS/iPadOS Advisory, Apple macOS Tahoe Advisory, Apple macOS Sequoia Advisory).