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

DLA 2612-1: leptonlib security update

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Debian LTS Advisory DLA-2612-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
March 31, 2021   https://wiki.debian.org/LTS
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Package : leptonlib
Version : 1.74.1-1+deb9u1
CVE ID : CVE-2020-36277 CVE-2020-36278 CVE-2020-36279
CVE-2020-36281

Several issues have been found by ClusterFuzz in leptonlib, an image
processing library.

All issues are related to heap-based buffer over-read in several functions
or a denial of service (application crash) with crafted data.

For Debian 9 stretch, these problems have been fixed in version
1.74.1-1+deb9u1.

We recommend that you upgrade your leptonlib packages.

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

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