A nbd security update has been released for Debian GNU/Linux 10 and 11 to address two vulnerabilities.

DSA 5100-1: nbd security update

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Debian Security Advisory DSA-5100-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 12, 2022   https://www.debian.org/security/faq
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Package : nbd
CVE ID : CVE-2022-26495 CVE-2022-26496
Debian Bug : 1003863 1006915

Two vulnerabilities were discovered in the server for the Network Block
Device (NBD), which could result in the execution of arbitrary code.

For the oldstable distribution (buster), these problems have been fixed
in version 1:3.19-3+deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:3.21-1+deb11u1.

We recommend that you upgrade your nbd packages.

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

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/