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Vendor Workaround
Restrict network access to the PgBouncer listener to trusted clients. No configuration change avoids the issue for deployments that must accept SCRAM authentication from untrusted networks, because the crash occurs before any credential is verified and PgBouncer performs a mock SCRAM exchange even for users that do not exist.
Tracking
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| Link | Providers |
|---|---|
| https://www.pgbouncer.org/changelog.html |
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Wed, 23 Sep 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Wed, 23 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer | |
| Weaknesses | CWE-476 | |
| References |
| |
| Metrics |
cvssV3_1
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Subscriptions
No data.
Status: PUBLISHED
Assigner: PostgreSQL
Published:
Updated: 2026-09-23T16:46:13.585Z
Reserved: 2026-08-14T16:55:37.365Z
Link: CVE-2026-19888
Updated: 2026-09-23T16:36:44.516Z
Status : Received
Published: 2026-09-23T17:17:14.917
Modified: 2026-09-23T17:17:14.917
Link: CVE-2026-19888
No data.
OpenCVE Enrichment
No data.
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CWE-476
NULL Pointer Dereference