Vulnerability · Published Nov 3, 2026 · Assigned by zdi

CVE-2026-114549NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability

Critical 9.8

In plain English

A critical-severity heap buffer overflow in NoMachine from NoMachine. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).

Severity (CVSS 3.0)9.8Critical

Exploit odds (30 days)0.6%top 51.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
NoMachine	NoMachine	9.7.3

Weakness: CWE-122 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ZDI-26-786 x_research-advisory