A firejail security update has been released for Debian GNU/Linux 9 LTS to address a local privilege escalation issue.

DLA 3061-1: firejail security update

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Debian LTS Advisory DLA-3061-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
June 29, 2022   https://wiki.debian.org/LTS
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Package : firejail
Version : 0.9.58.2-2+deb9u1
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 Debian 9 stretch, this problem has been fixed in version
0.9.58.2-2+deb9u1.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS