CVE-2026-6664

HIGH 7.5

PgBouncer integer overflow in PgBouncer network packet parsing

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-190
Vendor	n/a
Product	pgbouncer
Published	May 9, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

n/a / PgBouncer

0 < 1.25.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

pgbouncer.org: https://www.pgbouncer.org/changelog.html#pgbouncer-125x

Credits

Thanks to Johannes Möller for finding and reporting this problem.