How severe is CVE-2026-105390?

CVE-2026-105390 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-105390 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-105390?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-105390 published?

CVE-2026-105390 was published on 2026-10-13 and last updated on 2026-10-15.

CVE-2026-105390

CVE-2026-105390 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-413.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-413
Published: 2026-10-13
Last modified: 2026-10-15

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.

Frequently asked questions

What is CVE-2026-105390?: 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.
How severe is CVE-2026-105390?: CVE-2026-105390 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-105390 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-105390?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-105390 published?: CVE-2026-105390 was published on 2026-10-13 and last updated on 2026-10-15.

References

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

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