CVE-2025-2291Network attack vector

Authentication bypass via expiry-blind password lookup

Published Apr 16, 2025 · Updated Nov 3, 2025

Authentication bypass in PgBouncer before 1.24.1 allows remote attackers to log in through the proxy with an expired PostgreSQL password. The default auth_query returns rolpassword from pg_authid without checking rolvaliduntil, so PgBouncer accepts a hash that PostgreSQL treats as expired. Exposure requires auth_user with the default or a similarly unsafe custom auth_query and a valid password whose VALID UNTIL time has passed.

CVSS severity8.1
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in PgBouncer before 1.24.1 allows remote attackers to log in through the proxy with an expired PostgreSQL password. The default auth_query returns rolpassword from pg_authid without checking rolvaliduntil, so PgBouncer accepts a hash that PostgreSQL treats as expired. Exposure requires auth_user with the default or a similarly unsafe custom auth_query and a valid password whose VALID UNTIL time has passed.

The record

CVE
CVE-2025-2291
Published
Apr 16, 2025
Updated
Nov 3, 2025
Vendor
PgBouncer
Product
PgBouncer
Classifications
CWE-324, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.24.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PgBouncer · PgBouncerversion=0 <1.24.1

Published CVSS scores

8.1PostgreSQLCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-324Use of a Key Past its Expiration Date
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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