CVE-2026-3838VulnerabilityPublished 9 Mar 2026

ZDI-26-171: Unraid Update Request Path Traversal Remote Code Execution Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity

High

Rated High by Zero Day Initiative · No CVSS score from NVD or the CNA

EPSS: 0.8% chance of exploitation in 30 days – higher than 58% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

remote

What to do

AI-suggested

Apply the official patch by upgrading Unraid to version 7.2.4 or later, where this vulnerability is fixed. Since the vendor has released an official fix, remediation should be performed promptly to prevent exploitation. No additional mitigations are specified in the advisory.

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Unraid. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-3838.

Impact

Successful exploitation allows authenticated remote attackers to execute arbitrary code with root privileges on affected Unraid installations. This can lead to full system compromise, including confidentiality, integrity, and availability impacts as indicated by the CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Summary

This vulnerability in Unraid's update.php file arises from insufficient validation of user-supplied paths used in file operations, enabling authenticated remote attackers to perform path traversal and execute arbitrary code as root. The flaw allows attackers to escalate privileges and compromise the system. The issue was responsibly disclosed to the vendor on February 19, 2026, and publicly released on March 9, 2026. The vendor addressed the vulnerability in Unraid version 7.2.4.

References

zerodayinitiative.com/advisories/ZDI-26-171/ (opens in a new tab)

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