PgBouncer default auth_query does not take Postgres password expiry into account

published 2025-04-16 18 mo ago modified 2026-09-08 2 mo ago also BIT-pgbouncer-2025-2291 , EUVD-2025-11379

cvss: 8.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits: 0; none known

Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value, which allows an attacker to log in with an already expired password

Patch / fix

fixed in 2 distros 2

bitnami pgbouncer 1.24.1
n/a PgBouncer 1.24.1

debian azure linux

pgbouncer Debian 12 1.18.0-1+deb12u1
pgbouncer Debian 14, Debian 13 1.24.1-1

debian advisories DEBIAN-CVE-2025-2291

pgbouncer CBL-Mariner 2.0, Azure Linux 3.0 1.24.1-1

azure linux advisories AZL-60437 AZL-60438

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 18 mo ago (2025-04-16)

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	pgbouncer	<1.24.1	1.24.1

Affected products

n/a PgBouncer

Classification

Weakness

CWE-324 Use of a Key Past its Expiration Date

References

pgbouncer.org /changelog.html#pgbouncer-124x
release-notes, article
lists.debian.org /debian-lts-announce/2025/05/msg00032.html
mailing-list, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2025-2291
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary