NoMachine mDNS Heap-based Buffer Overflow Remote Code Execution Vulnerability

September 16th, 2026
ZDI-26-710 ZDI-CAN-30982

CVE ID

CVE-2026-92208

CVSS Score

8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

NoMachine

Affected Products

NoMachine

Vulnerability Details

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.

Additional Details

Fixed in NoMachine v10.1.7, v9.9.6 and v8.27.1
https://kb.nomachine.com/software-updates


Disclosure Timeline

  • 2026-08-07 - Vulnerability reported to vendor
  • 2026-09-16 - Coordinated public release of advisory
  • 2026-09-16 - Advisory Updated

Credit

Tobias Vonmetz

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