An openldap security update has been released for Debian GNU/Linux 9 LTS.to address a SQL injection vulnerability.

DLA 3017-1: openldap security update

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Debian LTS Advisory DLA-3017-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Dominik George
May 20, 2022   https://wiki.debian.org/LTS
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Package : openldap
Version : 2.4.44+dfsg-5+deb9u9
CVE ID : CVE-2022-29155
Debian Bug :

Jacek Konieczny discovered a SQL injection vulnerability in the back-sql
backend to slapd in OpenLDAP, a free implementation of the Lightweight
Directory Access Protocol, allowing an attacker to alter the database
during an LDAP search operations when a specially crafted search filter
is processed.

For Debian 9 stretch, this problem has been fixed in version
2.4.44+dfsg-5+deb9u9.

We recommend that you upgrade your openldap packages.

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

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