A security update has been released for the pgbouncer package, which is a lightweight connection pooler for PostgreSQL. The update fixes a vulnerability (CVE-2025-12819) that allowed an unauthenticated attacker to execute arbitrary SQL during authentication. The issue was fixed in version 1.15.0-1+deb11u2, and users are recommended to upgrade their pgbouncer packages.

[DLA 4422-1] pgbouncer security update

[SECURITY] [DLA 4422-1] pgbouncer security update

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Debian LTS Advisory DLA-4422-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Andreas Henriksson
December 27, 2025 https://wiki.debian.org/LTS
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Package : pgbouncer
Version : 1.15.0-1+deb11u2
CVE ID : CVE-2025-12819
Debian Bug :

PgBouncer is a lightweight connection pooler for PostgreSQL.

CVE-2025-12819

Untrusted search path in auth_query connection handler in PgBouncer before
1.25.1 allows an unauthenticated attacker to execute arbitrary SQL during
authentication via a malicious search_path parameter in the StartupMessage.

For Debian 11 bullseye, this problem has been fixed in version
1.15.0-1+deb11u2.

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