CVE-2026-3838
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Path Traversal in Unraid update.php Enables Root Remote Code Execution

Publication date: 2026-03-16

Last updated on: 2026-03-17

Assigner: Zero Day Initiative

Description
Unraid Update Request Path Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Unraid. Authentication is required to exploit this vulnerability. The specific flaw exists within the update.php file. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-28951.
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Meta Information
Published
2026-03-16
Last Modified
2026-03-17
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3838
EUVD
EUVD-2026-12166
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
unraid unraid 7.2.3
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

CVE-2026-3838 is a remote code execution vulnerability found in Unraid systems. It arises from improper validation of a user-supplied path in the update.php file before performing file operations. This flaw allows an authenticated remote attacker to execute arbitrary code with root privileges on affected installations.

Impact Analysis

This vulnerability can have severe impacts as it allows a remote attacker, who has authentication, to execute arbitrary code with root privileges on the affected Unraid system. This means the attacker can fully control the system, potentially leading to data theft, system compromise, disruption of services, or further attacks within the network.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, you should update your Unraid installation to version 7.2.4 or later, where the issue has been fixed.

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