CVE-2026-3839: Path Traversal in Unraid

The primary impact of CVE-2026-3839 is the ability for an attacker to bypass authentication on an Unraid server. Because authentication is not required to exploit this vulnerability, any user with network access to the server could potentially exploit it. Successful exploitation could lead to unauthorized access to sensitive data stored on the NAS, including user credentials, configuration files, and personal files. The attacker could also modify system settings, install malware, or use the compromised server as a launchpad for further attacks within the network. This vulnerability shares similarities with other authentication bypass flaws where lack of input validation allows attackers to manipulate file paths.

1. Reserved2026-03-09
2. Published2026-03-13
3. Modified2026-03-16
4. EPSS updated2026-03-23

The primary mitigation for CVE-2026-3839 is to upgrade Unraid to a patched version as soon as it becomes available. Until the upgrade can be performed, consider implementing temporary workarounds to reduce the attack surface. Restrict network access to the Unraid server by using firewalls to limit inbound connections to only necessary ports. Closely monitor authentication logs for suspicious activity, such as unexpected login attempts or access to sensitive files. Consider implementing a Web Application Firewall (WAF) to filter malicious requests targeting the authentication endpoint. After upgrading, confirm the vulnerability is resolved by attempting to access restricted resources without authentication.