---
id: CVE-2026-107349
title: >-
  An infinite loop in PgBouncer 1.20.0 through 1.26.0 allows an unauthenticated
  remote attacker to cause a denial of service
summary: >-
  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_startu…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-835
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T18:17:25.557'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107349'
references:
  - url: 'https://www.pgbouncer.org/changelog.html'
    label: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
tags:
  - nvd
ingestedAt: '2026-10-14T18:47:39.309Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.