CVE-2026-63649 - Windows interactive service arbitrary config load bypass

The Windows interactive service in OpenVPN 2.x allows local authenticated users to bypass the trusted configuration directory constraint and load arbitrary configuration files via the --setenv opt config option that bypasses the whitelist checks of allowed options.

Affects versions 2.4.0 through 2.6.21 and 2.7_alpha1 through 2.7.5. This is fixed in versions 2.6.22 and 2.7.6.