An issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. watchOS before 4.2.2 is affected. The issue involves the "LinkPresentation" component. It allows remote attackers to cause a denial of service (resource consumption) via a crafted text message.
https://support.apple.com/HT208465
https://support.apple.com/HT208464
https://support.apple.com/HT208463
http://www.securitytracker.com/id/1040267