CVE-2026-6664

PgBouncer integer overflow in PgBouncer network packet parsing

CVE-2026-6664 is fixed in pgbouncer on 1 platform, first by DEBIAN-CVE-2026-6664, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0070

53rd percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pgbouncer · Debian 13.5 (trixie)	1.24.1-1+deb13u2	DEBIAN-CVE-2026-6664	May 27, 2026
pgbouncer · Debian 14	1.25.2-1	DEBIAN-CVE-2026-6664	May 27, 2026

Details

Published
May 9, 2026
Weakness
Integer Overflow or Wraparound
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6664

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