An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, tvOS 14.0, macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, watchOS 7.0, iOS 14.0 and iPadOS 14.0. Processing a maliciously crafted audio file may lead to arbitrary code execution.
https://support.apple.com/en-us/HT212011
https://support.apple.com/en-us/HT211931
https://support.apple.com/en-us/HT211850