A postgresql-9.6 security update has been released for Debian GNU/Linux 9 LTS.

DLA 2817-1: postgresql-9.6 security update

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Debian LTS Advisory DLA-2817-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
November 12, 2021   https://wiki.debian.org/LTS
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Package : postgresql-9.6
Version : 9.6.24-0+deb9u1
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 Debian 9 stretch, these problems have been fixed in version
9.6.24-0+deb9u1.

We recommend that you upgrade your postgresql-9.6 packages.

For the detailed security status of postgresql-9.6 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/postgresql-9.6

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