Heap-based Buffer Overflow in NoMachine nxwebrunner Affects Multiple Versions
CVE-2026-114549

9.8CRITICAL

Key Information:

Vendor

Nomachine

Status
Nomachine
Vendor
CVE Published:
3 November 2026

What is CVE-2026-114549?

The NoMachine nxwebrunner has a vulnerability in its web service that listens on TCP port 4443 by default, allowing remote attackers to execute arbitrary code. The flaw stems from inadequate validation of the length of user-supplied data before copying it to a heap-based buffer. This oversight enables attackers to leverage the vulnerability and execute code in the context of the service account without requiring authentication.

Affected Version(s)

NoMachine 9.7.3

References

https://www.zerodayinitiative.com/advisories/ZDI-26-786/
x_research-advisory

CVSS V3.0

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.