HTMLDOC 1.9.7 allows a stack-based buffer overflow in the hd_strlcpy() function in string.c (when called from render_contents in ps-pdf.cxx) via a crafted HTML document.
https://lists.debian.org/debian-lts-announce/2021/07/msg00000.html
https://lists.debian.org/debian-lts-announce/2019/12/msg00008.html