A libbsd security update has been released for Debian GNU/Linux 9 LTS an out-of-bounds read.

DLA 2566-1: libbsd security update

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Debian LTS Advisory DLA-2566-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
February 18, 2021   https://wiki.debian.org/LTS
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Package : libbsd
Version : 0.8.3-1+deb9u1
CVE ID : CVE-2019-20367

An issue has been found in libbsd, a library with utility functions from
BSD systems.
A non-NUL terminated symbol name in the string table might result in an
out-of-bounds read.

For Debian 9 stretch, this problem has been fixed in version
0.8.3-1+deb9u1.

We recommend that you upgrade your libbsd packages.

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

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