Apple was supposed to completely fix the eavesdropping vulnerability triggered via the Group feature in the FaceTime app last week, but it looks like the company found a few more bugs and fixed them as well. One bug is related to the Live Photos feature in FaceTime, while the other two are related to memory corruption flaws occurring in the IOKit and Foundation.
https://www.notebookcheck.net/Apple-finally-fixes-eavesdropping-Group-FaceTime-bug-via-iOS-12-1-4.405596.0.html