An issue was discovered in certain Apple products. iOS before 10.3 is affected. macOS before 10.12.4 is affected. tvOS before 10.2 is affected. watchOS before 3.2 is affected. The issue involves the \libc++abi\ component. A use-after-free vulnerability allows remote attackers to execute arbitrary code via a crafted C++ app that is mishandled during demangling.