A firejail security update has been released for Debian GNU/Linux 10 and 11 to address a local privilege escalation to root.

DSA 5167-1: firejail security update

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Debian Security Advisory DSA-5167-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 22, 2022   https://www.debian.org/security/faq
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Package : firejail
CVE ID : CVE-2022-31214
Debian Bug : 1012510

Matthias Gerstner discovered that the --join option of Firejail,
a sandbox to restrict an application environment, was susceptible
to local privilege escalation to root.

For the oldstable distribution (buster), this problem has been fixed
in version 0.9.58.2-2+deb10u3.

For the stable distribution (bullseye), this problem has been fixed in
version 0.9.64.4-2+deb11u1.

We recommend that you upgrade your firejail packages.

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

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/