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

DSA 5080-1: snapd security update

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Debian Security Advisory DSA-5080-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 18, 2022   https://www.debian.org/security/faq
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Package : snapd
CVE ID : CVE-2021-44730 CVE-2021-44731

Multiple vulnerabilties were discovered in snapd, a daemon and tooling
that enable Snap packages, which could result in bypass of access
restrictions or privilege escalation.

For the oldstable distribution (buster), these problems have been fixed
in version 2.37.4-1+deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 2.49-1+deb11u1.

We recommend that you upgrade your snapd packages.

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

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/