A stack-based buffer overflow in image_load_bmp() in HTMLDOC <= 1.9.13 results in remote code execution if the victim converts an HTML document linking to a crafted BMP file.
https://lists.debian.org/debian-lts-announce/2022/02/msg00022.html
https://github.com/michaelrsweet/htmldoc/issues/456
https://github.com/michaelrsweet/htmldoc/issues/453
https://github.com/michaelrsweet/htmldoc/compare/v1.9.12...v1.9.13
https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b