CVE-2026-78221

Medium

Description

An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.

SeverityMedium

CVSS5.9

Exploit probability—

ProductOpenVPN

PublishedSep 7, 2026

First seenSep 7, 2026

Weakness typeCWE-131CWE-131

How to fix

Vendor advisories

community.openvpn.net/Security%20Announcements/CVE-2026-78221

Affected products

Product	Affected versions	Fixed in
OpenVPN OpenVPN	2.7_alpha1 ≤ v ≤ 2.7.6	—

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