The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: mailman 1:2.1.26-1ubuntu0.4 Ubuntu 16.04 ESM: mailman 1:2.1.20-1ubuntu0.6+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5121-1
CVE-2021-42096, CVE-2021-42097
https://launchpad.net/ubuntu/+source/mailman/1:2.1.26-1ubuntu0.4
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