CVE-2026-107349

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

CVE-2026-107349 is fixed in pgbouncer on 1 platform by DEBIAN-CVE-2026-107349 (version 1.26.1-1), released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0040

34th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pgbouncer · Debian 14	1.26.1-1	DEBIAN-CVE-2026-107349	Oct 16, 2026

Details

Published
October 14, 2026
Weakness
Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-107349

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