OpenVPN Windows Arg Parse Flaw: Auth User Cmd Exec (2.1_rc102.7.6)
CVE-2026-84256 Published on September 7, 2026
An argument parsing issue in OpenVPN 2.1_rc10 through 2.6.22 and 2.7_alpha1 through 2.7.6 on Windows allows remote authenticated users to execute arbitrary commands via a crafted certificate subject
Vulnerability Analysis
CVE-2026-84256 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Types
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-84256 has been classified to as a Shell injection vulnerability or weakness.
What is an Argument Injection Vulnerability?
The software constructs a string for a command to executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.
CVE-2026-84256 has been classified to as an Argument Injection vulnerability or weakness.
Products Associated with CVE-2026-84256
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Affected Versions
OpenVPN:- Version 2.1_rc10, <= 2.6.22 is affected.
- Version 2.7_alpha1, <= 2.7.6 is affected.