CVE-2026-114549
NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability
- Risk score
- 64/100
- CVSS
- 9.8 v3.0
- Published
- 4 Nov 2026
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What to know
- What it is
- A heap-based buffer overflow vulnerability in NoMachine nxwebrunner allows remote attackers to execute arbitrary code without authentication. An attacker can leverage this vulnerability to execute code in the context of the service account.
- Affected
- {'products': ['NoMachine nxwebrunner'], 'packages': [], 'versions': []}
- Fix
- Check the linked advisory for a fix, as none is provided.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.8 critical
- Remotely exploitable without logging in
References
Original description
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.
Last activity 4 Nov 2026. Patch Forecast updates every hour.