# CVE-2026-105390: OpenVPN ovpn-dco-win synchronization deadlock

Source: https://junglewise.ai/threats/cve-2026-105390-improper-synchronization-in-the-openvpn-ovpn-dco-win-for-windows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-105390 · Severity: info · Published 2026-10-13

OpenVPN's Windows VPN driver (ovpn-dco-win) contains a synchronization flaw that allows an unprivileged local attacker to trigger a deadlock by writing crafted data to the device, rendering the entire host unresponsive. This can be exploited by any local user without special privileges, causing denial of service.

Technologies: [Openvpn Ovpn-Dco-Win](https://junglewise.ai/threats/technologies/ovpn-dco-win). Vendors: [Openvpn](https://junglewise.ai/threats/vendors/openvpn).

## Quick answers

**Is CVE-2026-105390 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105390 being exploited in the wild.

**How severe is CVE-2026-105390?** Informational severity, published 13 October 2026.

**Which products and versions are affected?** Openvpn Ovpn-Dco-Win 0.6.5 through 1.3.3; 2.4.0 through 2.8.7.

**Is there a fix for CVE-2026-105390?** Yes: fixed in ovpn-dco-win 1.3.4, 2.8.13. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105390 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-105390?** Check whether you run Openvpn Ovpn-Dco-Win at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in ovpn-dco-win 1.3.4, 2.8.13

## Technical details

An improper synchronization vulnerability in the ovpn-dco-win kernel driver fails to properly release a device lock across socket send operations, allowing a local attacker to craft a device write that deadlocks the host. The vulnerability is triggered via direct writes to the ovpn-dco device and requires only local access with no elevated privileges. The issue is fixed in ovpn-dco-win 1.3.4 and 2.8.13.

## Affected products

- OpenVPN ovpn-dco-win 0.6.5 through 1.3.3; 2.4.0 through 2.8.7

## Timeline

- 2026-10-13: disclosed

## References

- [https://community.openvpn.net/Security%20Announcements/CVE-2026-105390](https://community.openvpn.net/Security%20Announcements/CVE-2026-105390)

## Related threats

- [OpenVPN ovpn-dco-win race condition denial of service](https://junglewise.ai/threats/cve-2026-115402-openvpn-ovpn-dco-win-0-6-5-through-2-8-13-allows-unprivileged)
- [OpenVPN ovpn-dco-win use-after-free in driver](https://junglewise.ai/threats/cve-2026-82325-openvpn-ovpn-dco-win-use-after-free-in-driver)
- [OpenVPN ovpn-dco-win heap overflow in epoch key generator](https://junglewise.ai/threats/cve-2026-11604-openvpn-ovpn-dco-win-heap-overflow-in-epoch-key-generator)