# CVE-2026-115402: OpenVPN ovpn-dco-win race condition denial of service

Source: https://junglewise.ai/threats/cve-2026-115402-openvpn-ovpn-dco-win-0-6-5-through-2-8-13-allows-unprivileged  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-115402 · Severity: info · Published 2026-10-28

OpenVPN's Windows data-channel offload driver (ovpn-dco-win) contains a race condition in TCP connection handling that allows any local user to crash the system. An attacker can exploit this flaw by triggering a socket teardown during an in-flight TCP connect operation, resulting in system instability or outage.

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-2026-115402 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115402 being exploited in the wild.

**How severe is CVE-2026-115402?** Informational severity, published 28 October 2026.

**Which products and versions are affected?** Openvpn Ovpn-Dco-Win 1.5.8 through 2.8.13.

**Is there a fix for CVE-2026-115402?** Yes: fixed in ovpn-dco-win 2.8.14 (shipped with OpenVPN 2.7.8-I002). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-115402 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-115402?** 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 2.8.14 (shipped with OpenVPN 2.7.8-I002)

## Technical details

The ovpn-dco-win kernel driver fails to hold a reference to a socket during TCP connect operations, allowing concurrent teardown to close the socket while Windows Sockets Kernel (WSK) is still using it. This leads to either double-completion of the connect request or use-after-free, triggering a kernel bug check. The vulnerability requires local access but no privileges.

## Affected products

- OpenVPN ovpn-dco-win 1.5.8 through 2.8.13

## Timeline

- 2026-10-28: disclosed

## References

- [https://community.openvpn.net/Security%20Announcements/CVE-2026-115402](https://community.openvpn.net/Security%20Announcements/CVE-2026-115402)

## Related threats

- [OpenVPN ovpn-dco-win synchronization deadlock](https://junglewise.ai/threats/cve-2026-105390-improper-synchronization-in-the-openvpn-ovpn-dco-win-for-windows)
- [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)