There is an illegal WRITE memory access at common-image.c (function load_image) in libcaca 0.99.beta19 for 4bpp data.
https://usn.ubuntu.com/3860-2/
https://usn.ubuntu.com/3860-1/
https://github.com/cacalabs/libcaca/issues/37
https://github.com/cacalabs/libcaca/commit/3e52dabe3e64dc50f4422effe364a1457a8a8592
https://bugzilla.redhat.com/show_bug.cgi?id=1652621
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00033.html