An out-of-bounds write vulnerability was fixed by improving bounds checking in multiple Apple operating systems. The flaw could cause unexpected process termination when processing a maliciously crafted asset catalog. The issue is resolved in iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27.