A denial of service issue was addressed with improved validation. This issue is fixed in iOS 12.1.3, macOS Mojave 10.14.3, watchOS 5.1.3. Processing a maliciously crafted message may lead to a denial of service.Referenceshttps://support.apple.com/HT209446https://support.apple.com/HT209443http://www.securityfocus.com/bid/106697https://support.apple.com/HT209448
