The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: python-pysaml2 3.0.0-3ubuntu1.16.04.4+esm1 python3-pysaml2 3.0.0-3ubuntu1.16.04.4+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5066-2
https://ubuntu.com/security/notices/USN-5066-1
CVE-2021-21239
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