ZDI-26-247: NoMachine External Control of File Path Arbitrary File Deletion Vulnerability
This vulnerability allows local attackers to delete arbitrary files on affected installations of NoMachine. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.1. The following CVEs are assigned: CVE-2026-5053.
AI Analysis
Technical Summary
This vulnerability in NoMachine arises from insufficient validation of environment variable paths used in file operations. A local attacker who can execute low-privileged code can exploit this flaw to delete arbitrary files with root-level permissions. The CVSS v3.1 base score assigned by ZDI is 7.1, reflecting a high impact on integrity and availability but requiring local access and privileges. The issue was reported to the vendor on February 6, 2026, and fixed in version 9.4.14.
Potential Impact
Successful exploitation allows an attacker with local low-privileged code execution to delete arbitrary files as root, impacting system integrity and availability. There is no confidentiality impact. This could lead to denial of service or disruption of critical files on the system.
Mitigation Recommendations
A fix is available and has been released by NoMachine in version 9.4.14. Users should upgrade to this version or later to remediate the vulnerability. NoMachine is not a cloud service; therefore, remediation requires applying the vendor's patch. There are no indications that additional mitigations or workarounds are necessary.
ZDI-26-247: NoMachine External Control of File Path Arbitrary File Deletion Vulnerability
Description
This vulnerability allows local attackers to delete arbitrary files on affected installations of NoMachine. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.1. The following CVEs are assigned: CVE-2026-5053.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in NoMachine arises from insufficient validation of environment variable paths used in file operations. A local attacker who can execute low-privileged code can exploit this flaw to delete arbitrary files with root-level permissions. The CVSS v3.1 base score assigned by ZDI is 7.1, reflecting a high impact on integrity and availability but requiring local access and privileges. The issue was reported to the vendor on February 6, 2026, and fixed in version 9.4.14.
Potential Impact
Successful exploitation allows an attacker with local low-privileged code execution to delete arbitrary files as root, impacting system integrity and availability. There is no confidentiality impact. This could lead to denial of service or disruption of critical files on the system.
Mitigation Recommendations
A fix is available and has been released by NoMachine in version 9.4.14. Users should upgrade to this version or later to remediate the vulnerability. NoMachine is not a cloud service; therefore, remediation requires applying the vendor's patch. There are no indications that additional mitigations or workarounds are necessary.
Technical Details
- Article Source
- {"url":"http://www.zerodayinitiative.com/advisories/ZDI-26-247/","fetched":true,"fetchedAt":"2026-05-26T19:59:24.190Z","wordCount":187}
Threat ID: 6a15fc93e29bf47b5055e1ab
Added to database: 5/26/2026, 8:03:31 PM
Last enriched: 5/26/2026, 8:14:35 PM
Last updated: 5/27/2026, 4:47:36 AM
Views: 4
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