A postgresql-13 security update has been released for Debian GNU/Linux 11 to address two security issues.

DSA 5401-1: postgresql-13 security update

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Debian Security Advisory DSA-5401-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 11, 2023   https://www.debian.org/security/faq
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Package : postgresql-13
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 the stable distribution (bullseye), these problems have been fixed in
version 13.11-0+deb11u1.

We recommend that you upgrade your postgresql-13 packages.

For the detailed security status of postgresql-13 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/postgresql-13

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/