CVE-2026-84599 is a vulnerability affecting multiple Apple operating systems where improper memory handling could allow an app to cause unexpected system termination or corrupt kernel memory. The issue has been addressed with improved memory handling in several Apple OS versions including iOS 26.7.2, iPadOS 26.7.2, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27.