mspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, 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 CHM file.
www.debian.org/security/2017/dsa-3946
bugzilla.clamav.net/show_bug.cgi?id=11701
github.com/varsleak/varsleak-vul/blob/master/clamav-vul/heap-overflow/clamav_chm_crash.md
github.com/vrtadmin/clamav-devel/commit/a83773682e856ad6529ba6db8d1792e6d515d7f1
lists.debian.org/debian-lts-announce/2018/02/msg00014.html
security.gentoo.org/glsa/201804-16