Vulnerability · Published Sep 23, 2026 · Assigned by PostgreSQL
CVE-2026-19888NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
High 7.5
In plain English
A high-severity null pointer dereference in PgBouncer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pgbouncer | no fix listed | DEBIAN-CVE-2026-19888 |
| Debian:13 | pgbouncer | no fix listed | DEBIAN-CVE-2026-19888 |
| Debian:14 | pgbouncer | 1.26.0-1 | DEBIAN-CVE-2026-19888 |
| Ubuntu:22.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-19888 |
| Ubuntu:24.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-19888 |
| Ubuntu:26.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-19888 |
| Ubuntu:26.10 | pgbouncer | no fix listed | UBUNTU-CVE-2026-19888 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H