A flaw was found in htmldoc in v1.9.12 and prior. A stack buffer overflow in parse_table() in ps-pdf.cxx may lead to execute arbitrary code and denial of service.
https://ubuntu.com/security/CVE-2021-23206
https://github.com/michaelrsweet/htmldoc/issues/416
https://github.com/michaelrsweet/htmldoc/commit/ba61a3ece382389ae4482c7027af8b32e8ab4cc8