NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer (CVE-2026-19888) | HOL Guard CVE

High · CVSS 7.5CVE-2026-19888

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

Answer in brief

CVE-2026-19888 records a High severity (CVSS 7.5) vulnerability in NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer. The current sources do not mark it as known exploited. The current feed maps n/a/PgBouncer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2026Updated Sep 23, 2026Source checked Sep 23, 2026First seen by HOL Sep 23, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/PgBouncer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n/a/PgBouncergeneric	>=0 <=1.25.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for n/a/PgBouncer.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 23, 2026

Sources and claim methodology

Source referencepgbouncer.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.