iOS 12.1 released and fixed around 31 vulnerabilities that belong to AppleAVD, Contacts, FaceTime, Graphics Driver, ICU, IPSec, Kernel, Messages etc.
Natalie Silvanovich of Google Project Zero contributed more in this fixes and he reported several critical vulnerabilities in iOS that allows an attacker to execute arbitrary code on the previous version of iOS.
Apple also Fixed a pair of interesting vulnerabilities in FaceTime that were discovered and reported by Natalie Silvanovich of Google Project Zero. CVE-2018-4366 would allow an attacker to view memory contents in CVE-2018-4367.
Safari 12.0.1 released and fixed 12 vulnerabilities that affected Safari Reader, WebKit with different vulnerabilities such as arbitrary code execution, Multiple memory corruption.
— US-CERT (@USCERT_gov) October 30, 2018
Apple Released Security Updates
Also you can Learn how to update the iOS software on your iPhone, iPad, or iPod touch.