The printDefineFont2 function (util/listfdb.c) in libming through 0.4.8 is vulnerable to a heap-based buffer overflow, which may allow attackers to cause a denial of service or unspecified other impact via a crafted FDB file.
https://security.gentoo.org/glsa/201904-24
https://lists.debian.org/debian-lts-announce/2018/04/msg00008.html