The hncbd90 component in Hancom Office 9.6.1.9403 allows a use-after-free via an unknown object in a crafted .docx file.
https://starlabs.sg/advisories/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-7115
http://help.hancom.com/update_en_multilang/details/HOfficeNEO_update.htm