A postgresql-11 security update has been released for Debian GNU/Linux 10 to address multiple security issues.

DSA 4915-1: postgresql-11 security update

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Debian Security Advisory DSA-4915-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 13, 2021   https://www.debian.org/security/faq
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Package : postgresql-11
CVE ID : CVE-2021-32027 CVE-2021-32028 CVE-2021-32029

Multiple security issues have been discovered in the PostgreSQL database
system, which could result in the execution of arbitrary code or
disclosure of memory content.

For the stable distribution (buster), these problems have been fixed in
version 11.12-0+deb10u1.

We recommend that you upgrade your postgresql-11 packages.

For the detailed security status of postgresql-11 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/postgresql-11

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/