---
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
vendor: Red Hat
product: PgBouncer
affected:
  - PgBouncer >= 1.20.0 < 1.26.1
patched:
  - hardened_images
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T21:17:18.340'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107349.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107349'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552735'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-107349'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107349'
  - url: 'https://access.redhat.com/errata/RHSA-2026:83843'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00404
epssPercentile: 0.34469
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T20:19:04.558160Z'
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.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107349.json)
- **RHSA-2026:83843** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:83843)