---
id: CVE-2026-114549
title: >-
  NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution
  Vulnerability
summary: >-
  NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution
  Vulnerability. This vulnerability allows remote attackers to execute arbitrary
  code on affected installations of NoMachine. Authentication is not required to
  exploit …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: NoMachine
product: NoMachine
affected:
  - NoMachine 9.7.3
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-11-06T18:54:22.382693Z'
published: '2026-11-03'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T18:54:33.023Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114549'
references:
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-26-786/'
    label: ZDI-26-786
tags:
  - cve.org
epss: 0.00584
epssPercentile: 0.48147
zeroDay: true
ingestedAt: '2026-11-05T20:33:06.621Z'
---

## Overview

NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the web service, which listens on TCP port 4443 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-30685.

## Affected

- `NoMachine 9.7.3`

## Remediation

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