The MP4_ReadBox_String function in modules/demux/mp4/libmp4.c in VideoLAN VLC media player before 2.1.6 allows remote attackers to trigger an unintended zero-size malloc and conduct buffer overflow attacks, and consequently execute arbitrary code, via a box size of 7.
https://www.videolan.org/security/sa1501.html
https://github.com/videolan/vlc/commit/2e7c7091a61aa5d07e7997b393d821e91f593c39