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

DSA 5006-1: postgresql-11 security update

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Debian Security Advisory DSA-5006-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 11, 2021   https://www.debian.org/security/faq
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Package : postgresql-11
CVE ID : CVE-2021-23214 CVE-2021-23222

Jacob Champion discovered two vulnerabilities in the PostgreSQL database
system, which could result in man-in-the-middle attacks.

For the oldstable distribution (buster), these problems have been fixed
in version 11.14-0+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/