---
id: CVE-2026-105390
title: >-
  Improper synchronization in the OpenVPN ovpn-dco-win for Windows versions
  0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger
  a deadlock via a crafted write to the ovpn-dco device, causing the host to
  become unr…
summary: >-
  Improper synchronization in the OpenVPN ovpn-dco-win for Windows versions
  0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger
  a deadlock via a crafted write to the ovpn-dco device, causing the host to
  become unr…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-413
  - CWE-833
vendor: OpenVPN
product: ovpn-dco-win
affected:
  - ovpn-dco-win >= 0.6.5 <= 1.3.5
  - ovpn-dco-win >= 2.4.0 <= 2.8.7
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T20:38:04.303'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105390'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2026-105390'
    label: security@openvpn.net
tags:
  - nvd
  - cve.org
epss: 0.00113
epssPercentile: 0.01432
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T18:07:58.275427Z'
cvssSource: cna
ingestedAt: '2026-10-14T00:07:19.218Z'
---

## Overview

Improper synchronization in the OpenVPN ovpn-dco-win for Windows versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger a deadlock via a crafted write to the ovpn-dco device, causing the host to become unresponsive.

## Remediation

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