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

DLA 2879-1: ghostscript security update

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Debian LTS Advisory DLA-2879-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
January 14, 2022   https://wiki.debian.org/LTS
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Package : ghostscript
Version : 9.26a~dfsg-0+deb9u8
CVE ID : CVE-2021-45944 CVE-2021-45949

Multiple security issues were discovered in Ghostscript, the GPL
PostScript/PDF interpreter, which could result in denial of service and
potentially the execution of arbitrary code if malformed document files
are processed.

For Debian 9 stretch, these problems have been fixed in version
9.26a~dfsg-0+deb9u8.

We recommend that you upgrade your ghostscript packages.

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

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