CVE-2026-19888

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 2026-09-23. Last modified 2026-09-23.