A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 14.0 and iPadOS 14.0. Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution.
https://support.apple.com/en-us/HT211850
https://support.apple.com/en-us/HT211850
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9972