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CVE-2026-6664

35
FAUCET Score

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.

First published: May 9, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.25.2CPE matchmatch criteria
cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 25th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: 21328-17084Fixed in: 1.25.2-1
microsoftpatch availablevia msrc
Product: azl3 pgbouncer 1.25.1-1 on Azure Linux 3.0Fixed in: 1.25.2-1

Vendor Advisories (1)

microsoft2026-May/CVE-2026-6664Important

PgBouncer integer overflow in PgBouncer network packet parsing

May 7, 2026

References

pgbouncer.org / changelog.html
Release Notes