Description
Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in this way stop it from serving traffic for every other database and client it is pooling, so the failure of a single backend is not contained.
Published: 2026-09-23
Score: 5.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
History

Wed, 23 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Pgbouncer
Pgbouncer pgbouncer
Vendors & Products Pgbouncer
Pgbouncer pgbouncer

Wed, 23 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in this way stop it from serving traffic for every other database and client it is pooling, so the failure of a single backend is not contained.
Title Unbounded SCRAM iteration count causes CPU exhaustion in PgBouncer
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Pgbouncer Pgbouncer
cve-icon MITRE

Status: PUBLISHED

Assigner: PostgreSQL

Published:

Updated: 2026-09-23T16:46:13.708Z

Reserved: 2026-04-20T12:25:47.129Z

Link: CVE-2026-6669

cve-icon Vulnrichment

Updated: 2026-09-23T16:36:50.297Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T17:17:16.223

Modified: 2026-09-23T19:40:10.000

Link: CVE-2026-6669

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T19:00:07Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption