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OpenAdvisories
High · 7.5 Public exploit CVE-2026-6664 EUVD-2026-28876GHSA-pmgp-q838-fh9g

PgBouncer integer overflow in PgBouncer network packet parsing

Published May 9, 2026 · Updated May 11, 2026 · Assigned by PostgreSQL

Package: pgbouncer Package: pgbouncer Package: pgbouncer Package: pgbouncer Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu Ecosystem: Wolfi

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.

Affected products

VendorProductAffectedFixed
— PgBouncer < 1.25.2 1.25.2

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 pgbouncer 1.25.2-1 —
Debian 13 pgbouncer 1.24.1-1+deb13u2 —
Debian 12 pgbouncer No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 pgbouncer No fix yet —
Ubuntu 26.04 LTS pgbouncer No fix yet —
Ubuntu 25.10 pgbouncer No fix yet —
Ubuntu 24.04 LTS pgbouncer No fix yet —
Ubuntu 22.04 LTS pgbouncer No fix yet —
Show 3 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS pgbouncer No fix yet —
Ubuntu 18.04 LTS pgbouncer No fix yet —
Ubuntu 16.04 LTS pgbouncer No fix yet —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 pgbouncer 1.25.2-1 —

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling pgbouncer 1.25.1-r1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References