CVE-2026-6664
PgBouncer integer overflow in PgBouncer network packet parsing
Description
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.
INFO
Published Date :
May 9, 2026, 1:16 a.m.
Last Modified :
May 14, 2026, 6:52 p.m.
Remotely Exploit :
No
Source :
f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 |
Solution
- Update PgBouncer to version 1.25.2 or later.
- Apply the latest security patches for PgBouncer.
Public PoC/Exploit Available at Github
CVE-2026-6664 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2026-6664.
| 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-2026-6664 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-2026-6664
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).
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📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-6664 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-6664 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 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 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-190 Added Reference https://www.pgbouncer.org/changelog.html#pgbouncer-125x