CVE-2026-6665

PgBouncer buffer overflow in SCRAM

State: Published
Severity: 8.1 High
Published: May 9, 2026
Updated: May 12, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	PostgreSQL

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
PgBouncern/a	before 1.25.2Affected

References

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

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