The OpenVPN community project team is proud to release OpenVPN 2.6.22. This is a bugfix release fixing several security issues.
**Important note:** After this release the support status of OpenVPN 2.6 changes from "Full Support" to "Old Stable Support". This means that we might not provide Windows installer downloads of future 2.6.x releases. Please upgrade to OpenVPN 2.7. Security fixes: * openvpnserv (windows): better scrutinize command line passed in from the control socket to openvpn. This would lead to circumventing admin restrictions on allowed openvpn config directories (but never to "read files the user has no permissions for") (CVE-2026-63649) Bug found by 章鱼哥 (www.aipyaipy.com) * dco: make key state desync recoverable This was reported as a "with suitable timing, a key-update de-sync between OpenVPN and the kernel could trigger an ASSERT()", and was initially handled as security report. It turned out to be not exploitable, but the state machine was not very robust and so the opportunity was used to improve the code. Bug found by 章鱼哥 (www.aipyaipy.com) Bugfixes: * refuse incoming HARD RESET packets with a sequence ID != 0 (this is basically making an OpenVPN server ignore and log a "should never happen" client-side misbehaviour, which could lead to TLS handshake establishment failures in p2p TLS setups) * correct minimum packet length check for 802.1q tagged packets (Github: OpenVPN/openvpn#1044). This was also reported (twice) as a security bug, as technically OpenVPN with --client-nat would read and write up to 4 bytes "after the end of the packet" - but due to the OpenVPN packet buffer layouts, which are always full-frame-sized this is fully safe and has no adverse consequences. More details can be found in the Changes document: <https://github.com/OpenVPN/openvpn/blob/v2.6.22/Changes.rst> Source code and Windows installers can be downloaded from our download page: <https://community.openvpn.net/Downloads> Packages for Debian, Ubuntu, Fedora, RHEL, and openSUSE are available in the various official Community repositories: <https://community.openvpn.net/Pages/OpenVPN%20software%20repos> Kind regards, -- Frank Lichtenheld _______________________________________________ Openvpn-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/openvpn-devel
