---
id: CVE-2026-114458
title: >-
  Mod_qos: undersized connection-monitor scratch array permits heap buffer
  overflow
summary: >-
  A flaw was found in mod_qos. An unauthenticated remote attacker can cause a
  Denial of Service (DoS) by maintaining numerous concurrent low-rate
  connections to a target server. When connection rate monitoring is active, the
  module fails t…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: pbuchbinder
product: mod_qos
affected:
  - mod_qos 11.74
  - mod_qos 11.76
  - mod_qos 11.79
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T06:37:04.887Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114458'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-114458'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2558393'
    label: RHBZ#2558393
tags:
  - cve.org
ingestedAt: '2026-10-22T07:32:31.147Z'
---

## Overview

A flaw was found in mod_qos. An unauthenticated remote attacker can cause a Denial of Service (DoS) by maintaining numerous concurrent low-rate connections to a target server. When connection rate monitoring is active, the module fails to verify array boundaries when recording client IP addresses, allowing more connection records to be added than the allocated buffer can hold. This issue leads to heap memory corruption, which can crash the web server process.

## Affected

- `mod_qos 11.74`
- `mod_qos 11.76`
- `mod_qos 11.79`

## Remediation

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