The chmd_read_headers function in chmd.c in libmspack before 0.5 does not validate name lengths, which allows remote attackers to cause a denial of service (buffer over-read and application crash) via a crafted CHM file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-4489
https://bugs.debian.org/774726
http://www.securityfocus.com/bid/72486