CVE-2026-6665

PgBouncer buffer overflow in SCRAM

CVE-2026-6665 is fixed in pgbouncer on 1 platform, first by DEBIAN-CVE-2026-6665, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

9.8

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0037

31st percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pgbouncer · Debian 13.5 (trixie)	1.24.1-1+deb13u2	DEBIAN-CVE-2026-6665	May 27, 2026
pgbouncer · Debian 14	1.25.2-1	DEBIAN-CVE-2026-6665	May 27, 2026

Details

Published
May 9, 2026
Weakness
Stack-based Buffer Overflow
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6665

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