A htmldoc security update has been released for Debian GNU/Linux 9 LTS to address a buffer overflow.

DLA 2700-1: htmldoc security update

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Debian LTS Advisory DLA-2700-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
July 01, 2021   https://wiki.debian.org/LTS
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Package : htmldoc
Version : 1.8.27-8+deb9u1
CVE ID : CVE-2019-19630 CVE-2021-20308 CVE-2021-23158
CVE-2021-23165 CVE-2021-23180 CVE-2021-23191
CVE-2021-23206 CVE-2021-26252 CVE-2021-26259
CVE-2021-26948

A buffer overflow was discovered in HTMLDOC, a HTML processor that
generates indexed HTML, PS, and PDF, which could potentially result
in the execution of arbitrary code. In addition a number of crashes
were addressed.

For Debian 9 stretch, these problems have been fixed in version
1.8.27-8+deb9u1.

We recommend that you upgrade your htmldoc packages.

For the detailed security status of htmldoc please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/htmldoc

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS