CVE-2026-19888

NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer

CVE-2026-19888 is fixed in pgbouncer on 1 platform by DEBIAN-CVE-2026-19888 (version 1.26.0-1), released October 4, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0039

33rd percentile

Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pgbouncer · Debian 14	1.26.0-1	DEBIAN-CVE-2026-19888	Oct 4, 2026

Details

Published
September 23, 2026
Weakness
NULL Pointer Dereference
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-19888

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