by Kastro
Paper/Archive/CVE-2026-114549

CVE-2026-114549

NoMachine NoMachine — NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVSS 9.8
critical.is priorityof 100
29
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
NoMachine9.7.3–CNA

Scores by source

zdi (CNA)9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refzerodayinitiative.com/advisories/ZDI-26-786