In ytnef 1.9.2, the MAPIPrint function in lib/ytnef.c allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-18402
https://blogs.gentoo.org/ago/2017/05/24/ytnef-null-pointer-dereference-in-mapiprint-ytnef-c/