---
id: CVE-2026-106017
title: >-
  Improper certificate validation in the OpenVPN 3 Core library version 3.4
  through 3.11.7 allows attackers to circumvent extended key usage restrictions.
summary: >-
  Improper certificate validation in the OpenVPN 3 Core library version 3.4
  through 3.11.7 allows attackers to circumvent extended key usage restrictions.
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U'
cvssSource: cna
cwe:
  - CWE-295
vendor: OpenVPN
product: OpenVPN 3 Core Library
affected:
  - 3_core_library >= 3.4 <= 3.11.7
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T09:18:01.956Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-106017'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2026-106017'
tags:
  - cve.org
ingestedAt: '2026-10-22T09:34:48.703Z'
---

## Overview

Improper certificate validation in the OpenVPN 3 Core library version 3.4 through 3.11.7 allows attackers to circumvent extended key usage restrictions.

## Affected

- `3_core_library >= 3.4 <= 3.11.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.