Version 2.7.7-I001 du 04/09/2026- Security fixed : reliability layer: avoid unbounded reliable TLS timeout, and ignore acks for packets that cannot be outstanding (CVE-2026-84732).
- Security fixed : Both reliability layer bugs found by Mark Bregman (Fox-IT).
- Security fixed : windows: fix CreateProcess() command line quoting for characters that are special to cmd.exe, where a combination of validation script plus rogue CA could lead to misbehavior (CVE-2026-84256).
- Security fixed : Bug found by Clouditera Security.
- Security fixed : windows: fix tapctl to always call netsh.exe with full path (as we do elsewhere) (CVE-2026-84226).
- Security fixed : Bug found by BreachX Zero Day Labs (using Typhon AI Mil v2).
- Security fixed : windows: don't use NULL DACL with system objects, namely the --service exit event and the netsh.exe guard semaphore.
- Security fixed : The old approach was prone to a local DoS where one user could interfere with other users' openvpn processes by blocking the netsh semaphore or sending events. This only affects setups not using the iservice, or using the automatic service to start/stop openvpn (CVE-2026-82312).
- Security fixed : Bug found by DEBRAJ BASAK.
- Security fixed : openvpnserv (windows): pass correct NRPT domains size - when IDN domains with UTF8 encoding were involved, a buffer overread could be achieved (CVE-2026-78221).
- Security fixed : Bug found by BreachX Zero Day Labs (using Typhon AI Mil v2).
- Security fixed : openvpnserv (windows): don't allow '/' in config paths.
- Security fixed : The APIs windows uses for path validation do not handle '/' as path separator, while the file open APIs do, so this could be used to circumvent our config path validation, leading to openvpn.exe starting a user-controlled config file even if administratively not allowed (CVE-2026-78043).
- Security fixed : Bug found by BreachX Zero Day Labs (using Typhon AI Mil v2).
- Security fixed : dhcp (windows): fix off-by-one in write_dhcp_search_str() temp buffer guard - suitable DHCP options could lead to a single-byte overflow of a temp buffer (CVE-2026-81738).
- Security fixed : Bug found by Andre Kropp (Nexory) and ChinhNguyen.
- Security fixed : linux netlink: validate netlink replies against the request.
- Security fixed : Suggested by Joshua Rogers as a security improvement.
- Security fixed : openvpnserv (windows): fix off-by-one on input validation (discovered while fixing CVE-2026-78221).
- Security fixed : openvpnserv (windows): harden CheckConfigPath() a bit more (another improvement while working on CVE-2026-78043).
- Changed : when using EPOCH data channel format, reduce the number of future keys from 16 to 4 - the previous calculation was wrong, and 4 spare keys are sufficient for 100+ Gbit/s links. This means less log spam in userland and fewer resources used in in-kernel implementations.
- Fixed : work around a pubkey-handling bug in mbedTLS 4.1.0 and 4.2.0 (supposedly fixed in 4.3.0).
- Fixed : multi: don't let stale-routes-check delete permanent routes - --stale-routes-check did not only delete dynamic cached routes, but also routes installed by --iroute and --ifconfig-push. Fixed by introducing route flags and restraining the check on them (Github: OpenVPN/openvpn#1063).
- Fixed : ssl: do not queue control ciphertext while a packet is still queued (fixes problems in TCP p2p handshake when both sides try to handshake at the same time) (Github: OpenVPN/openvpn#1089).
- Fixed : reenable xmit_hold when using p2p tcp-server and tls-server - in TCP server mode the server is not expected to initiate the TLS handshake. This was introduced by the multisocket code checking the wrong variable for socket protocol (Github: OpenVPN/openvpn#1089).
- Fixed : clinat: do not adjust UDP checksum if zero (as per RFC768)(Github: OpenVPN/openvpn#1037).
- Fixed : openssl: avoid resetting the HMAC key on every packet.
- Fixed : (Github: OpenVPN/openvpn#1088).
- Fixed : openvpnserv (windows): fix log lines format string - interface names with international characters printed in some error messages need to be converted from UTF8 to UCS16 first.
- Fixed : fix format string specifier for size_t (%zu).
- Fixed : fix test_misc compile issues with -Werror.
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