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Fencer Intel
high 7.5

CVE-2026-19888 json

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

published last mo. modified last mo. also BIT-pgbouncer-2026-19888 , EUVD-2026-85365

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami pgbouncer 1.26.0
  • pgbouncer pgbouncer 1.26.0
  • pgbouncer Debian 14 1.26.0-1

debian advisories DEBIAN-CVE-2026-19888

  • pgbouncer hummingbird 1 1.26.0-0.1.hum1

red hat advisories RHSA-2026:70698

  • pgbouncer Azure Linux 3.0 1.26.0-1

azure linux advisories AZL-103430

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-19888 updated cvss 7.5

pgbouncer: PgBouncer: Denial of Service via malformed SCRAM client-final-message

  • Red Hat Hardened Images pgbouncer 1.26.0-0.1.hum1
    fixed: vendor fix RHSA-2026:70698

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami pgbouncer
<1.26.0
1.26.0

Affected products

  • n/a PgBouncer

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.