A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2 Security Update 2021-001 Catalina Security Update 2021-001 Mojave tvOS 14.4 watchOS 7.3 iOS 14.4 and iPadOS 14.4 Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.