A jbig2dec security update has been released for Debian GNU/Linux 9 LTS to address two issues.

DLA 2796-1: jbig2dec security update

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Debian LTS Advisory DLA-2796-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
October 29, 2021   https://wiki.debian.org/LTS
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Package : jbig2dec
Version : 0.13-4.1+deb9u1
CVE ID : CVE-2017-9216 CVE-2020-12268

Two issues have been found in jbig2dec, a JBIG2 decoder library.
One issue is related to an overflow with a crafted image file. The other
is related to a NULL pointer dereference.

For Debian 9 stretch, these problems have been fixed in version
0.13-4.1+deb9u1.

We recommend that you upgrade your jbig2dec packages.

For the detailed security status of jbig2dec please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/jbig2dec

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