NULL pointer dereference in Pgbouncer

CVE-2026-19888

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

  • Pgbouncer

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-19888?
CVE-2026-19888 is a high-severity vulnerability in Pgbouncer, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-09-23.
How severe is CVE-2026-19888?
High severity. CVSS v3 base score is 7.5 out of 10.