A htmldoc security update has been released for Debian GNU/Linux 9 LTS to address several issues.

DLA 2928-1: htmldoc security update

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Debian LTS Advisory DLA-2928-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
February 26, 2022   https://wiki.debian.org/LTS
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Package : htmldoc
Version : 1.8.27-8+deb9u2
CVE ID : CVE-2021-40985 CVE-2021-43579 CVE-2022-0534

Several issues have been found in htmldoc, an HTML processor that
generates indexed HTML, PS, and PDF.

CVE-2022-0534

A crafted GIF file could lead to a stack out-of-bounds read,
which could result in a crash (segmentation fault).

CVE-2021-43579

Converting an HTML document, which links to a crafted BMP file,
could lead to a stack-based buffer overflow, which could result
in remote code execution.

CVE-2021-40985

A crafted BMP image could lead to a buffer overflow, which could
cause a denial of service.

For Debian 9 stretch, these problems have been fixed in version
1.8.27-8+deb9u2.

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