Path traversal in OpenVPN Server - CVE-2026-78043
Published: September 5, 2026
Vulnerability identifier: #VU147010
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78043
CWE-ID: CWE-22
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause OpenVPN to start a user-controlled configuration file.
The vulnerability exists due to path traversal in openvpnserv configuration-path validation when processing config paths containing '/'. A local user can provide a config path containing '/' to cause OpenVPN to start a user-controlled configuration file.
Windows path-validation APIs do not treat '/' as a path separator, while file-opening APIs do.
Affected software
OpenVPN Server
How to mitigate CVE-2026-78043
Install security update from vendor's website.
OpenVPN Server - update to 2.7.7