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

DLA 3422-1: postgresql-11 security update

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Debian LTS Advisory DLA-3422-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
May 15, 2023   https://wiki.debian.org/LTS
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Package : postgresql-11
Version : 11.20-0+deb10u1
CVE ID : CVE-2023-2454 CVE-2023-2455

Two security issues were found in PostgreSQL, which may result in
privilege escalation or incorrect policy enforcement.

For Debian 10 buster, these problems have been fixed in version
11.20-0+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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS