The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: firejail 0.9.62-3ubuntu0.1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5141-1
CVE-2021-26910
https://launchpad.net/ubuntu/+source/firejail/0.9.62-3ubuntu0.1
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