A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 12.3, tvOS 12.3, watchOS 5.2.1. An application may be able to execute arbitrary code with system privileges.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8593
Reference (s):
- https://support.apple.com/HT210118
- https://support.apple.com/HT210120
- https://support.apple.com/HT210122