Security fixes:

• CVE-2024-4877: Windows: harden interactive service pipe. Security scope: a malicious process with "some" elevated privileges (SeImpersonatePrivilege) could open the pipe a second time, tricking openvn GUI into providing user credentials (tokens), getting full access to the account openvpn-gui.exe runs as. (Zeze with TeamT5)
• CVE-2024-5594: control channel: refuse control channel messages with nonprintable characters in them. Security scope: a malicious openvpn peer can send garbage to openvpn log, or cause high CPU load. (Reynir Björnsson)
• CVE-2024-28882: only call schedule_exit() once (on a given peer). Security scope: an authenticated client can make the server "keep the session" even when the server has been told to disconnect this client (Reynir Björnsson)

New features:

• Windows Crypto-API: Implement Windows CA template match for searching certificates in windows crypto store.
• Support pre-created DCO interface on FreeBSD (OpenVPN would fail to set ifmode p2p/subnet otherwise)

Bug fixes:

• Fix connect timeout when using SOCKS proxies (trac #328, github #267)
• Work around LibreSSL crashing on OpenBSD 7.5 when enumerating ciphers (LibreSSL bug, already fixed upstream, but not backported to OpenBSD 7.5, see also LibreSSL/OpenBSD#150)
• Add bracket in fingerprint message and do not warn about missing verification (github #516)

Documentation:

• Remove "experimental" denotation for --fast-io
• Correctly document ifconfig_* variables passed to scripts
• Documentation: make section levels consistent
• Samples: Update sample configurations (remove compression & old cipher settings, add more informative comments)

Windows Client: Community MSI installer for Windows client can be found at Community Downloads.

Linux Packages: Instructions for installing community-maintained Linux packages can be found in the Community Wiki.

Full Changelog: https://github.com/OpenVPN/openvpn/compare/v2.6.10...v2.6.11