CVE-2026-43743: 
macOS vulnerability analysis and mitigation

CVE-2026-43743 is a race condition vulnerability in the IOGPUFamily component of Apple iOS, iPadOS, and macOS Tahoe that allows a local application to cause unexpected system termination. It was disclosed and patched on June 29, 2026, affecting iOS and iPadOS versions prior to 26.5.2 and macOS Tahoe versions prior to 26.5.2. The vulnerability was discovered by researchers identified as "Lyutoon" and "Dun." It carries a CVSS v3.1 base score of 4.7 (Medium) (Apple Advisory iOS/iPadOS, Github Advisory).

The vulnerability is classified as CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization / Race Condition) and resides in the IOGPUFamily kernel component. A timing window exists in which a shared resource can be modified by a concurrently executing code sequence, leading to an inconsistent or invalid system state. Exploitation requires local access with low privileges and involves high attack complexity due to the timing-dependent nature of race conditions; no user interaction is needed. Apple addressed the issue with improved state handling (Apple Advisory iOS/iPadOS, Apple Advisory macOS).

Successful exploitation results in an unexpected system termination (denial of service), impacting availability with no effect on confidentiality or data integrity. The vulnerability is limited in scope to the affected device and does not enable code execution, data exfiltration, or lateral movement based on current information. The primary risk is a local denial-of-service condition that could be triggered by a malicious application installed on the device (Apple Advisory iOS/iPadOS, Github Advisory).

Apple has released patches addressing this vulnerability in iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, all released on June 29, 2026. Users and administrators should update affected devices to these versions or later as the primary remediation. No configuration-based workarounds have been published by Apple (Apple Advisory iOS/iPadOS, Apple Advisory macOS).

The vulnerability was covered as part of broader reporting on Apple's June 2026 security update cycle, which addressed approximately 29–37 vulnerabilities across iOS, iPadOS, and macOS. Media outlets including Lifehacker and The Cyber Express highlighted the update batch, urging users to patch promptly. The SANS Internet Storm Center also noted the release in its diary. No specific researcher commentary or notable social media discussion focused exclusively on CVE-2026-43743 has been identified (Apple Advisory iOS/iPadOS).