CVE-2025-2291: Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNT

Q: How do I fix CVE-2025-2291?

pgbouncer: upgrade to 1.24.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2025-2291 being exploited?

CVE-2025-2291 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-2291 affect?

CVE-2025-2291 affects pgbouncer, debian linux. Severity is high (CVSS 8.1). 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

Q: How urgent is CVE-2025-2291?

Priority 46/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 8.1REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2025-2291 is a high-severity flaw (CVSS 8.1) affecting pgbouncer, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-324
Published	2025-04-16
Last modified	2026-06-17

Publisher (CNA): PostgreSQL · Vendor: debian · pgbouncer

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-16 18:16 UTCPublished CVE record published
2026-06-17 09:06 UTCUpdated Record last modified

pgbouncer pgbouncer UPGRADE

Affected: < 1.24.1

Fixed in: 1.24.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pgbouncer || rpm -q pgbouncer || pgbouncer --version

2. UPGRADE to 1.24.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pgbouncer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pgbouncer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-2291?

pgbouncer: upgrade to 1.24.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-2291 being exploited?

CVE-2025-2291 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-2291 affect?

CVE-2025-2291 affects pgbouncer, debian linux. Severity is high (CVSS 8.1). 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

How urgent is CVE-2025-2291?

Priority 46/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

PostgreSQL vulnerabilities · Debian vulnerabilities

Related CVEs

CVE-2025-12819 HIGH 7.5 UPGRADE Untrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated at
CVE-2026-6664 HIGH 7.5 UPGRADE An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and ca
CVE-2026-6665 HIGH 8.1 UPGRADE The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building
CVE-2026-6666 MEDIUM 5.9 UPGRADE A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error
CVE-2026-6667 MEDIUM 4.3 UPGRADE PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILL_CLIENT admin command

References

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