CVE-2026-6666
PgBouncer crash in kill_pool_logins_server_error
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.
INFO
Published Date :
May 9, 2026, 1:16 a.m.
Last Modified :
May 14, 2026, 6:49 p.m.
Remotely Exploit :
Yes !
Source :
f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update PgBouncer to 1.25.2 or later.
- Apply vendor patches for the crash vulnerability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-6666.
| URL | Resource |
|---|---|
| https://www.pgbouncer.org/changelog.html#pgbouncer-125x | Release Notes |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-6666 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-6666
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-6666 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-6666 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.2 Added Reference Type PostgreSQL: https://www.pgbouncer.org/changelog.html#pgbouncer-125x Types: Release Notes -
New CVE Received by f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
May. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added Reference https://www.pgbouncer.org/changelog.html#pgbouncer-125x