---
id: "CVE-2026-115402"
kind: "vulnerability"
aliases: ["CVE-2026-115402"]
title: "OpenVPN ovpn-dco-win: local users can crash Windows via TCP race"
severity: "medium"
cvss: 5.7
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "openvpn", "vpn-clients", "vpn-servers", "windows"]
not_affected_if: ["no-dco-driver", "non-windows"]
published_at: "2026-10-28T15:17:04+00:00"
first_seen_at: "2026-10-28T15:33:37+00:00"
updated_at: "2026-10-28T15:35:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115402", "first_seen_at": "2026-10-28T15:33:37+00:00"}]
---

# OpenVPN ovpn-dco-win: local users can crash Windows via TCP race

OpenVPN's ovpn-dco-win Windows driver has a race condition in its TCP connect path. A local user without special privileges can trigger it and crash the system.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed ovpn-dco-win driver version on Windows against the affected range `0.6.5` through `2.8.13`
- Confirm whether the OpenVPN data-channel offload (DCO) driver is installed on the host

## Fix

- Update ovpn-dco-win to a release newer than `2.8.13`; the exact fixed version is unknown from the sources

## Timeline

- 2026-10-28T15:33:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115402

## From the sources

OpenVPN ovpn-dco-win 0.6.5 through 2.8.13 allows unprivileged local users to cause a denial of service (system crash) via a race condition in the TCP connect path.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_