Description
Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.
Published: 2026-09-23
Score: 7.5 High
EPSS: n/a
KEV: No
AI Analysis

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Remediation

Vendor Workaround

Set max_packet_size well below 1073741824 so that no single packet can grow a packet buffer past the overflow threshold

Tracking

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Advisories

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References
Link Providers
https://www.pgbouncer.org/changelog.html cve-icon cve-icon
History

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

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

Type Values Removed Values Added
Description Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.
Title Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
Weaknesses CWE-190
CWE-835
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: PostgreSQL

Published:

Updated: 2026-09-23T16:46:13.834Z

Reserved: 2026-04-20T12:25:46.351Z

Link: CVE-2026-6668

cve-icon Vulnrichment

Updated: 2026-09-23T16:36:55.619Z

cve-icon NVD

Status : Received

Published: 2026-09-23T17:17:16.073

Modified: 2026-09-23T17:17:16.073

Link: CVE-2026-6668

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-190

    Integer Overflow or Wraparound

  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')