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Vulnerability record · CVE-2026-6666 · published 9 May 2026

CVE-2026-6666: Pgbouncer null pointer dereference vulnerability

Pgbouncer · Pgbouncer

A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.

7.5 CVSS 3.1 High EPSS 0.40% · top 67.8% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
24 Jul 2026Last modified by NVD

Description

A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.pgbouncer.org/changelog.html#pgbouncer-125x Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-6665Pgbouncer stack-based buffer overflow vulnerabilityThe SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-…EPSS 0.44%9.8CVE-2025-2291Pgbouncer vulnerabilityPassword can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value, which allows an attacker to l…EPSS 0.36%8.1CVE-2025-12819Pgbouncer untrusted search path vulnerabilityUntrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated attacker to execute arbitrary SQL during …EPSS 0.36%8.1CVE-2021-3935Pgbouncer sql injection vulnerabilityWhen PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first e…EPSS 1.1%8.1CVE-2015-6817Pgbouncer improper authentication vulnerabilityPgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user via an unknown username.EPSS 2.2%7.5CVE-2026-6664Pgbouncer integer overflow vulnerabilityAn integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to a crash. An unauthenticated r…EPSS 0.73%7.5CVE-2015-4054Pgbouncer null pointer dereference vulnerabilityPgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before …EPSS 4.1%5.6CVE-2021-3672C-ares project c-ares cross-site scripting vulnerabilityA flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of …EPSS 2.8%

Source: NIST National Vulnerability Database (record CVE-2026-6666), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.