PgBouncer up to 1.25.1 Network Packet integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in PgBouncer up to 1.25.1. This impacts an unknown function of the component Network Packet Handler. Such manipulation leads to integer overflow. This vulnerability is referenced as CVE-2026-6664. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in PgBouncer up to 1.25.1. Affected by this issue is an unknown code block of the component Network Packet Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is availability. CVE summarizes:

An 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 remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.

The weakness was published by Johannes Möller. The advisory is shared for download at pgbouncer.org. This vulnerability is handled as CVE-2026-6664 since 04/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 313599 (Linux Distros Unpatched Vulnerability : CVE-2026-6664), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.2 eliminates this vulnerability. The upgrade is hosted for download at pgbouncer.org.

The vulnerability is also documented in the databases at Tenable (313599) and CERT Bund (WID-SEC-2026-1445). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Microsoft Azure Linux
  • Open Source PgBouncer

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (PostgreSQL): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 313599
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-6664

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: PgBouncer 1.25.2

Timelineinfo

04/20/2026 CVE reserved
05/09/2026 +19 days Advisory disclosed
05/09/2026 +0 days VulDB entry created
05/13/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: pgbouncer.org
Researcher: Johannes Möller
Status: Confirmed

CVE: CVE-2026-6664 (🔒)
GCVE (CVE): GCVE-0-2026-6664
GCVE (VulDB): GCVE-100-362360
CERT Bund: WID-SEC-2026-1445 - PgBouncer: Mehrere Schwachstellen

Entryinfo

Created: 05/09/2026 06:48
Updated: 05/13/2026 02:30
Changes: 05/09/2026 06:48 (64), 05/10/2026 01:13 (2), 05/13/2026 02:30 (7)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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