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CVE-2026-105390 OpenVPN CVE debrief

A local attacker can trigger a deadlock in OpenVPN ovpn-dco-win for Windows versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 by crafting a write to the ovpn-dco device, causing the host to become unresponsive. This medium-severity vulnerability allows local attackers to trigger a deadlock via improper synchronization. Windows system administrators and security teams should assess exposure and prioritize patching for affected versions. The CVE Program record and NVD vulnerability detail provide official information on CVE-2026-105390. The OpenVPN Security Announcements page offers vendor-advisory details.

Vendor
OpenVPN
Product
ovpn-dco-win
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

Windows system administrators and security teams using OpenVPN ovpn-dco-win should assess exposure and prioritize patching for affected versions.

Why it matters

CVE-2026-105390 is a medium-severity vulnerability in OpenVPN ovpn-dco-win for Windows that allows local attackers to trigger a deadlock. Windows system administrators and security teams should assess exposure and prioritize patching for affected versions.

  • Verify and apply patches to prevent local attackers from triggering a deadlock
  • Monitor Windows systems for suspicious activity related to ovpn-dco device writes
  • Implement compensating controls to limit local attacker access to ovpn-dco device

Technical summary

CVE-2026-105390 is a medium-severity vulnerability in OpenVPN ovpn-dco-win for Windows. A local attacker can exploit improper synchronization by crafting a write to the ovpn-dco device, causing a deadlock that makes the host unresponsive. Affected versions include 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7.

Defensive priority

Medium priority for Windows systems using affected OpenVPN ovpn-dco-win versions; verify and apply vendor patches promptly.

Recommended defensive actions

  • Verify OpenVPN ovpn-dco-win version and apply patches for versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7
  • Monitor Windows systems for suspicious activity related to ovpn-dco device writes
  • Implement compensating controls to limit local attacker access to ovpn-dco device

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on CVE-2026-105390. The OpenVPN Security Announcements page offers vendor-advisory details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-105390 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-105390

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-105390 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-105390

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-105390

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/105xxx/CVE-2026-105390.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://community.openvpn.net/Security%20Announcements/CVE-2026-105390

    Supplemental source - vendor-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.