CVE-2026-43748: Apple macOS

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

Affected products

• Apple macOS: from 15.0, before 15.7.8 (fixed in 15.7.8); from 26.0, before 26.6 (fixed in 26.6)

Published 2026-07-27. Last modified 2026-09-14.