CVE-2026-20700
Description
CVE-2026-20700 is a high-severity memory corruption flaw in Apple OSs, actively exploited for arbitrary code execution. Update to version 26.3.
CPE
| Product | Version Start | Version End (excl.) | Status |
|---|---|---|---|
| ipados | * | 26.3 | vulnerable |
| iphone_os | * | 26.3 | vulnerable |
| macos | * | 26.3 | vulnerable |
| tvos | * | 26.3 | vulnerable |
| visionos | * | 26.3 | vulnerable |
| watchos | * | 26.3 | vulnerable |
Related weakness (CWE)
Remediation plan
Apply official patches
Install the latest security updates provided by Apple for your specific hardware. Apple has released patches for iOS, iPadOS, macOS, tvOS, visionOS, and watchOS to address the underlying state management issues causing memory corruption.
Update affected systems
Ensure all Apple devices are running version 26.3 or later. This includes updating iPhones and iPads to iOS/iPadOS 26.3, Macs to macOS Tahoe 26.3, and Apple Watches, TVs, or Vision Pro headsets to their respective 26.3 versions.
Restrict access
Since the attack vector is local, enforce strict physical device security and implement mobile device management (MDM) policies to prevent unauthorized local access. Limit the installation of unverified third-party applications that could be used as a vehicle for memory write attempts.
Monitor for exploitation
Use endpoint detection and response (EDR) tools to monitor for unusual system process behavior, unexpected kernel panics, or unauthorized memory access patterns. Review system logs for signs of sophisticated exploitation attempts linked to CVE-2026-20700.
Detection Guidance
Detection should focus on identifying anomalous local activity. Monitor system logs for frequent or unexplained application crashes and memory-related errors (CWE-119). Since this involves memory corruption, security teams should look for unauthorized code execution patterns or privilege escalation attempts within the OS kernel. Use MDM or EDR solutions to audit device versions and flag any hardware still running versions older than 26.3, especially in high-risk environments.