CVE-2026-84790

7.6High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

7.6High

Attack vector: Network
Complexity: High
Privileges needed: Low
User interaction: None
Impact: High impact on confidentiality, integrity
Weakness: CWE-158, CWE-290

Impact

Authenticated attackers can impersonate other VPN users to gain unauthorized access and read or alter data. They require a valid client certificate and network access to the OpenVPN server.

Root cause

Improper handling and parsing of control characters in certificate subject fields allows authentication spoofing.

Affected systems

OpenVPN 2.7_alpha1 through 2.7.7

CVSS v4.0 · CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Fix & remediation

Upgrade OpenVPN to a version newer than 2.7.7 once available. If you cannot upgrade immediately, review client certificate issuance pipelines to reject control characters in subject fields.

shell

$ openvpn --version

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

OpenVPN 2.7_alpha1 through 2.7.7 allows remote authenticated users to impersonate others via a crafted certificate subject field

References

https://community.openvpn.net/Security%20Announcements/CVE-2026-84790

Source: nvd.nist.gov/vuln/detail/CVE-2026-84790