CVE-2026-6665

8.1 HIGH 0.4% exploit odds No fix listed Memory safety Server

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-05-09 01:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-07-24 08:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-05-09 01:16 UTC
Last modified: 2026-07-24 08:10 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-121
Record status: Analyzed

Affected

Pgbouncer < 1.25.2

Attack profile CVSS 3.1 · 8.1

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

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References

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

NVD record · CVE.org record