A logic issue was addressed with improved validation. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, Security Update 2021-004 Catalina. Playing a malicious audio file may lead to an unexpected application termination.
https://support.apple.com/en-us/HT212605
https://support.apple.com/en-us/HT212604
https://support.apple.com/en-us/HT212602