A ghostscript security update has been released for Debian GNU/Linux 10 and 11.

DSA 5038-1: ghostscript security update

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Debian Security Advisory DSA-5038-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 08, 2022   https://www.debian.org/security/faq
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Package : ghostscript
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 the oldstable distribution (buster), these problems have been fixed
in version 9.27~dfsg-2+deb10u5.

For the stable distribution (bullseye), these problems have been fixed in
version 9.53.3~dfsg-7+deb11u2.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/