# CVE-2026-3839: Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability

> Remote attackers can bypass authentication in Unraid OS via path traversal in auth-request.php without needing credentials.

- **Severity:** High 7.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Mar 2026
- **Updated:** 16 Mar 2026
- **Also known as:** GHSA-hv24-53jm-mrp5

## What is CVE-2026-3839?

CVE-2026-3839 is a high-severity path traversal vulnerability in Unraid, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Unraid. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the auth-request.php file. The issue results from the lack of proper validation of a user-supplied path prior to using it in authentications. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28912.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-3839?

It affects 1 product.


Products: Unraid Unraid.

## How do I fix CVE-2026-3839?

No fix has been published for CVE-2026-3839 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3839 being exploited?

There is no known exploitation of CVE-2026-3839 in the wild and no public exploit code.

## Other vulnerabilities in Unraid

- [CVE-2020-5847](https://insights.sbomify.com/CVE-2020-5847/): Unraid Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-5849](https://insights.sbomify.com/CVE-2020-5849/): Unraid Authentication Bypass (high 7.5, exploited in the wild)
- [CVE-2026-9772](https://insights.sbomify.com/CVE-2026-9772/): Unraid Web Server FileUpload Command Injection Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-9773](https://insights.sbomify.com/CVE-2026-9773/): Unraid Web Server ToggleState Command Injection Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-3838](https://insights.sbomify.com/CVE-2026-3838/): Unraid Update Request Path Traversal Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3839 and fix it if it is affected.

What it is: CVE-2026-3839 is a high-severity path traversal vulnerability in Unraid, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3839 in the wild and no public exploit code.

Affected product: Unraid. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3839/ (Markdown: https://insights.sbomify.com/CVE-2026-3839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3839
- OSV: https://osv.dev/vulnerability/CVE-2026-3839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3839/
Summaries are generated and may contain mistakes; the official description above is the record.