CVE-2026-6665

Name: CVE-2026-6665
Creator: NVD / NIST
Published: 2026-05-09T01:16:09.013+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2026-6665 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.37%

29.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-121

Affected Software

Vendor	Product	Versions
Pgbouncer	Pgbouncer	< 1.25.2

References

https://www.pgbouncer.org/changelog.html#pgbouncer-125xRelease Notes

Timeline

Published: May 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-6665?

How severe is CVE-2026-6665?

CVE-2026-6665 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2026-6665?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-6665?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST