CVE-2026-114549
NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| NoMachine NoMachine |
9.7.3 (affected)
Other versions: unknown |
CNA: zdi |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.0 / 9.8 critical |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA: zdi |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://www.zerodayinitiative.com/advisories/ZDI-26-786/CNA: zdi · x_research-advisory
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