CVE-2026-5055

SYSTEM code execution via malicious DLL loading

Published Apr 11, 2026 · Updated Apr 11, 2026

Privilege escalation in NoMachine 9.2.18_1 allows local users to execute arbitrary code as SYSTEM through malicious DLL loading. NoMachine programs permit named-pipe impersonation to create arbitrary mount points, causing the Device Server to load a malicious library from an unsecured location. Low-privileged code execution on an affected Windows host is required, and successful exploitation grants SYSTEM privileges.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in NoMachine 9.2.18_1 allows local users to execute arbitrary code as SYSTEM through malicious DLL loading. NoMachine programs permit named-pipe impersonation to create arbitrary mount points, causing the Device Server to load a malicious library from an unsecured location. Low-privileged code execution on an affected Windows host is required, and successful exploitation grants SYSTEM privileges.

The record

CVE
CVE-2026-5055
Published
Apr 11, 2026
Updated
Apr 11, 2026
Vendor
NoMachine
Product
NoMachine
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.2.18_1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NoMachine · NoMachineversion=9.2.18_1

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001DLL Search Order Hijacking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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