CVE-2026-107349

Infinite loop on empty option name in startup options parameter in PgBouncer

State: Published
Severity: 7.5 High
Published: Oct 14, 2026
Updated: Oct 16, 2026
Reserved: Oct 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	PostgreSQL

Weaknesses

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
PgBouncern/a	1.20.0 to before 1.26.1Affected

References

https://www.pgbouncer.org/changelog.html

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