Vulnerability · Published Oct 14, 2026 · Assigned by PostgreSQL
CVE-2026-107349Infinite loop on empty option name in startup options parameter in PgBouncer
High 7.5
In plain English
A high-severity infinite loop in PgBouncer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated remote attacker to cause a denial of service. A StartupMessage whose options parameter contains an empty parameter name, such as "-c=", makes the ignore_startup_parameters list lookup loop forever. Because PgBouncer serves all clients from a single process, this saturates a CPU core and makes PgBouncer unresponsive to all clients until the process is restarted.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pgbouncer | no fix listed | DEBIAN-CVE-2026-107349 |
| Debian:13 | pgbouncer | no fix listed | DEBIAN-CVE-2026-107349 |
| Debian:14 | pgbouncer | 1.26.1-1 | DEBIAN-CVE-2026-107349 |
| Ubuntu:22.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-107349 |
| Ubuntu:24.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-107349 |
| Ubuntu:26.04:LTS | pgbouncer | no fix listed | UBUNTU-CVE-2026-107349 |
| Ubuntu:26.10 | pgbouncer | no fix listed | UBUNTU-CVE-2026-107349 |
Affected products (as reported)
Weakness: CWE-835, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H