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CVE-2026-78043 is a path traversal vulnerability in the OpenVPN Windows Interactive Service in versions 2.7_alpha1 through 2.7.6. The service’s trusted-configuration-directory validation did not reject forward slashes, despite Windows file APIs treating them as path separators. A local authenticated user could use traversal syntax containing forward slashes to evade the configuration-path restriction and make the service launch an OpenVPN configuration file outside the administrator-approved directory.
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A Windows openvpnserv configuration-path validation bypass that permits forward-slash path separators, potentially allowing an attacker to launch an administratively restricted OpenVPN configuration.
A Windows openvpnserv configuration-path validation bypass in which forward slashes are not blocked despite being valid Windows path separators, allowing execution of an administratively unauthorized OpenVPN configuration.
A local authenticated-user security bypass in OpenVPN's Windows Interactive Service. Crafted paths can bypass the trusted configuration-directory restriction, allowing arbitrary configuration files to be loaded.
A medium-severity local directory-traversal/path-canonicalization bypass in OpenVPN's Windows interactive service (openvpnserv). Forward slashes in a user-supplied configuration path can cause a /../ sequence to evade CheckConfigPath() directory restrictions, enabling a local low-privileged user to access configuration paths outside approved directories. Platforms that do not build openvpnserv are unaffected.
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