OpenVPN 2.7_alpha1-2.7.7 Auth Bypass via Crafted Cert Subject
CVE-2026-84790 Published on October 13, 2026
OpenVPN 2.7_alpha1 through 2.7.7 allows remote authenticated users to impersonate others via a crafted certificate subject field
Vulnerability Analysis
CVE-2026-84790 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of 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
Authentication Bypass by Spoofing
This attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.
Improper Neutralization of Null Byte or NUL Character
The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component. As data is parsed, an injected NUL character or null byte may cause the software to believe the input is terminated earlier than it actually is, or otherwise cause the input to be misinterpreted. This could then be used to inject potentially dangerous input that occurs after the null byte or otherwise bypass validation routines and other protection mechanisms.
Products Associated with CVE-2026-84790
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Affected Versions
OpenVPN:- Version 2.7_alpha1, <= 2.7.7 is affected.