Vulnerability · Published Oct 13, 2026 · Assigned by OpenVPN
CVE-2026-105390
Medium 6.9
In plain English
A medium-severity security flaw in ovpn-dco-win from OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.1%top 98.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenVPN | ovpn-dco-win | 0.6.5 – through 1.3.52.4.0 – through 2.8.7 |
Weakness: CWE-413, CWE-833 · Vector: 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