# 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-6664
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0070
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 9, 2026
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6664

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pgbouncer Debian 13.5 (trixie) | 1.24.1-1+deb13u2 | [DEBIAN-CVE-2026-6664](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6664.md) | May 27, 2026 |
| Linux | pgbouncer Debian 14 | 1.25.2-1 | [DEBIAN-CVE-2026-6664](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6664.md) | May 27, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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