CVE-2026-6666

PgBouncer crash in kill_pool_logins_server_error

5.9 MediumPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.37%Up 0.4 points since May 9, 2026

What each source reports

CVE List Score used 5.9

PgBouncer crash in kill_pool_logins_server_error

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.

Record: CVE-2026-6666
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

EUVDEUVD-2026-28878 5.9

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.

Record: EUVD-2026-28878
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-4463-8rvf-rj9f 5.9

A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server...

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.

Record: GHSA-4463-8rvf-rj9f
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

NVD 5.9

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.

Record: CVE-2026-6666
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-6666 7.5

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.

Record: DEBIAN-CVE-2026-6666
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-6666 5.9

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.

Record: UBUNTU-CVE-2026-6666
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVAZL-86243 No score

CVE-2026-6666 affecting package pgbouncer for versions less than 1.25.2-1

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.

Record: AZL-86243
Updated: 2026-11-02

OSVBIT-pgbouncer-2026-6666 No score

PgBouncer crash in kill_pool_logins_server_error

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.

Record: BIT-pgbouncer-2026-6666
Updated: 2026-11-02

Affected products

pgbouncer

Affected packages

Affected packages
Package	Affected	Fixed
`pgbouncer` Azure Linux:3	before 1.25.2-1	1.25.2-1
`pgbouncer` Bitnami	before 1.25.2	1.25.2
`pgbouncer` Debian:12	All versions, plus listed versions 1.18.0-11.18.0-1+deb12u11.19.0-11.19.1-11.20.0-1 Show 17 moreShow less 1.20.1-11.21.0-11.22.0-11.22.1-11.23.0-11.23.1-11.24.0-21.24.0-31.24.1-11.25.0-11.25.0-21.25.1-11.25.2-11.26.0-11.26.0-21.26.0-31.26.0-4	None known
`pgbouncer` Debian:13	before 1.24.1-1+deb13u2, plus listed versions 1.24.1-11.24.1-1+deb13u1	1.24.1-1+deb13u2
`pgbouncer` Debian:14	before 1.25.2-1, plus listed versions 1.24.1-11.25.0-11.25.0-21.25.1-1	1.25.2-1
`pgbouncer` Ubuntu:16.04:LTS	All versions, plus listed versions 1.5.5-11.6.1-11.7-1	None known
`pgbouncer` Ubuntu:18.04:LTS	All versions, plus listed versions 1.7.2-3build11.7.2-65-g2b8e6cf-11.8.1-11.8.1-1build1	None known
`pgbouncer` Ubuntu:20.04:LTS	All versions, plus listed versions 1.10.0-11.10.0-1build11.11.0-11.12.0-21.12.0-3	None known
`pgbouncer` Ubuntu:22.04:LTS	All versions, plus listed versions 1.15.0-11.16.1-1ubuntu1	None known
`pgbouncer` Ubuntu:24.04:LTS	All versions, plus listed versions 1.20.0-11.21.0-11.22.0-11.22.0-1build11.22.0-1build31.22.0-1build4	None known
`pgbouncer` Ubuntu:25.10	All versions, plus listed versions 1.24.0-31.24.1-1	None known
`pgbouncer` Ubuntu:26.10	All versions, plus listed versions 1.25.1-11.25.2-11.25.2-1ubuntu1	None known
`pgbouncer` Ubuntu:26.04:LTS	All versions, plus listed versions 1.24.1-11.25.0-21.25.1-1	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	George0Papasotiriou/CVE-2026-6666-XPC-Service-NSKeyedUnarchiver-Deserialization-Attack-macOS-iOS-simulation-	2026-08-03

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-6666 is a medium vulnerability (CVSS 5.9) in Pgbouncer, published May 9, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. Fixed in pgbouncer 1.25.2-1.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

Affected packages

Public exploits

History

In short

References