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

DLA 2805-1: libmspack security update

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Debian LTS Advisory DLA-2805-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
October 31, 2021   https://wiki.debian.org/LTS
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Package : libmspack
Version : 0.5-1+deb9u4
CVE ID : CVE-2019-1010305

Opening a crafted chm file could result in a buffer overflow in libmspack,
a library for Microsoft compression formats.

For Debian 9 stretch, this problem has been fixed in version
0.5-1+deb9u4.

We recommend that you upgrade your libmspack packages.

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

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