The MP4_ReadBox_String function in modules/demux/mp4/libmp4.c in VideoLAN VLC media player before 2.1.6 performs an incorrect cast operation from a 64-bit integer to a 32-bit integer, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a large box size.
https://www.videolan.org/security/sa1501.html
https://github.com/videolan/vlc/commit/2e7c7091a61aa5d07e7997b393d821e91f593c39