CVE-2026-6664 PgBouncer integer overflow in PgBouncer network packet parsing
An unauthenticated remote attacker can crash PgBouncer by sending a malformed SCRAM authentication packet due to an integer overflow in packet parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6664?
CVE-2026-6664 is a high-severity vulnerability in PgBouncer, published on 9 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-190
Which versions are affected by CVE-2026-6664?
1 open source package ship an affected version, including pgbouncer. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pgbouncer Bitnami | All versions | 1.25.2 |
Products include Pgbouncer Pgbouncer.
How do I fix CVE-2026-6664?
Upgrade pgbouncer to 1.25.2 or later.
Is CVE-2026-6664 being exploited?
There is no known exploitation of CVE-2026-6664 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in PgBouncer
Sources
Also known as AZL-86234, BIT-pgbouncer-2026-6664, CLEANSTART-2026-AK83492, DEBIAN-CVE-2026-6664, GHSA-pmgp-q838-fh9g, MINI-wphc-9f2g-98fw and 1 more.