CVE-2026-6668 Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
An integer overflow in PgBouncer allows remote attackers to cause a denial of service by triggering an infinite loop in packet buffer growth.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6668?
CVE-2026-6668 is a high-severity vulnerability in PgBouncer, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.
Which versions are affected by CVE-2026-6668?
1 open source package ship an affected version, including pgbouncer.
| Package | Affected | Fixed in |
|---|---|---|
pgbouncer Bitnami | All versions | 1.26.0 |
How do I fix CVE-2026-6668?
Upgrade pgbouncer to 1.26.0 or later.
Is CVE-2026-6668 being exploited?
There is no known exploitation of CVE-2026-6668 in the wild and no public exploit code.
Sources
Also known as AZL-103433, BIT-pgbouncer-2026-6668, DEBIAN-CVE-2026-6668, ECHO-0782-8daa-3154, GHSA-r96c-7w9v-wrc8, MINI-jh3j-mqmq-w2wv and 1 more.