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PgBouncer CVE-2026-6665

| EUVD-2026-28877 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-05-09 PostgreSQL GHSA-mhmx-mjv6-w337
Buffer Overflow Stack Overflow
8.1
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch available
May 09, 2026 - 02:16 EUVD
Analysis Generated
May 09, 2026 - 01:31 vuln.today
CVE Published
May 09, 2026 - 00:43 nvd
HIGH 8.1

DescriptionNVD

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

AnalysisAI

Stack overflow in PgBouncer before 1.25.2 enables malicious PostgreSQL backend servers to trigger remote code execution via SCRAM authentication nonce manipulation. The flaw stems from incorrect strlcat() return value checking during SCRAM client-final-message construction. …

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RemediationAI

Within 24 hours: Inventory all PgBouncer deployments and confirm current versions; assess whether backend PostgreSQL servers are exposed to untrusted networks or compromise risk. Within 7 days: Implement network segmentation to restrict backend PostgreSQL server access to trusted PgBouncer instances only; monitor for suspicious SCRAM authentication attempts. …

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CVE-2026-6665 vulnerability details – vuln.today
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