The mad_layer_III function in layer3.c in Underbit MAD libmad 0.15.1b allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted audio file.
https://www.debian.org/security/2018/dsa-4192
https://lists.debian.org/debian-lts-announce/2018/05/msg00011.html
https://blogs.gentoo.org/ago/2017/04/30/libmad-heap-based-buffer-overflow-in-mad_layer_iii-layer3-c/