A PostgreSQL security update has been released for Ubuntu Linux 20.04 LTS and 20.10.

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Ubuntu Security Notice USN-4735-1
February 15, 2021

postgresql-12 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

Summary:

PostgreSQL could be made to expose sensitive information.

Software Description:
- postgresql-12: Object-relational SQL database

Details:

Heikki Linnakangas discovered that PostgreSQL incorrectly leaked values of
denied columns when handling certain errors. A remote attacker could
possibly use this issue to obtain sensitive information.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
postgresql-12 12.6-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
postgresql-12 12.6-0ubuntu0.20.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart PostgreSQL to
make all the necessary changes.

References:
  https://usn.ubuntu.com/4735-1
CVE-2021-3393

Package Information:
  https://launchpad.net/ubuntu/+source/postgresql-12/12.6-0ubuntu0.20.10.1
  https://launchpad.net/ubuntu/+source/postgresql-12/12.6-0ubuntu0.20.04.1