An issue was discovered in WavPack 5.1.0 and earlier for W64 input. Out-of-bounds writes can occur because ParseWave64HeaderConfig in wave64.c does not validate the sizes of unknown chunks before attempting memory allocation, related to a lack of integer-overflow protection within a bytes_to_copy calculation and subsequent malloc call, leading to insufficient memory allocation.
https://www.debian.org/security/2018/dsa-4197
https://usn.ubuntu.com/3637-1/
https://seclists.org/bugtraq/2019/Dec/37
https://github.com/dbry/WavPack/issues/33
https://github.com/dbry/WavPack/commit/6f8bb34c2993a48ab9afbe353e6d0cff7c8d821d
http://packetstormsecurity.com/files/155743/Slackware-Security-Advisory-wavpack-Updates.html