CVE-2026-92208
Received Received - Intake

Heap-based Buffer Overflow in NoMachine mDNS

Vulnerability report for CVE-2026-92208, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-21

Last updated on: 2026-10-23

Assigner: Zero Day Initiative

Description

NoMachine mDNS Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of mDNS resource records. 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-30982.

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Meta Information

Published
2026-10-21
Last Modified
2026-10-23
Generated
2026-11-10
AI Q&A
2026-10-22
EPSS Evaluated
2026-11-09
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
NoMachine NoMachine 9.8.2_1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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Executive Summary

CVE-2026-92208 is a heap-based buffer overflow vulnerability in NoMachine software. It occurs during the parsing of mDNS resource records due to insufficient validation of user-supplied data length before copying it to a heap buffer. This allows network-adjacent attackers to execute arbitrary code without authentication.

Detection Guidance

Detecting this vulnerability requires checking the installed version of NoMachine against the patched versions (v10.1.7, v9.9.6, or v8.27.1). Use commands like 'nomachine -v' or check package managers (e.g., 'dpkg -l nomachine' for Debian/Ubuntu or 'rpm -qa | grep nomachine' for RHEL). Network detection involves monitoring for mDNS traffic anomalies or unexpected service behavior.

Impact Analysis

An attacker could exploit this vulnerability to execute code in the context of the NoMachine service account. This could lead to full system compromise, unauthorized access, or further network infiltration if the service account has elevated privileges.

Mitigation Strategies

Immediately update NoMachine to the latest patched versions (v10.1.7, v9.9.6, or v8.27.1) as provided by the vendor. If updating is not feasible, restrict network access to NoMachine services or disable mDNS parsing if possible. Monitor for unusual activity or unauthorized access attempts.

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