A pgbouncer security update has been released for Debian GNU/Linux 9 LTS to address an issue where PgBouncer was susceptible to an arbitrary SQL injection attack if a man-in-the-middle
could inject data when a connection using certificate authentication is established.

DLA 2922-1: pgbouncer security update

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Debian LTS Advisory DLA-2922-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
February 14, 2022   https://wiki.debian.org/LTS
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Package : pgbouncer
Version : 1.7.2-2+deb9u1
CVE ID : CVE-2021-3935

It was found that PgBouncer, a PostgreSQL connection pooler, was
susceptible to an arbitrary SQL injection attack if a man-in-the-middle
could inject data when a connection using certificate authentication is
established.

For Debian 9 stretch, this problem has been fixed in version
1.7.2-2+deb9u1.

We recommend that you upgrade your pgbouncer packages.

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

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