Synergy Dragon Alpha

v0.6.0 (October 19, 2026)

Security

• CVE-2021-42072: A computer on the network could connect as a client without its identity being properly checked.
• CVE-2021-42073: An attacker could take a client's place in a session by giving that client's name, and receive the keyboard, mouse and clipboard meant for it.

Features

• Keyboard, mouse and clipboard traffic between computers is now encrypted by default. A network set up on an earlier version turns encryption on by itself once every computer supports it, and names the computer holding it back until then.
• Joining a computer is now confirmed with seven emoji shown on both screens, instead of a long fingerprint to compare. A computer on an older version still compares the fingerprint.
• Portals let you choose a doorway on one computer's edge and a matching doorway on another, so the cursor crosses only there. Add them with the door button in the Layout tab's zoom controls.
• A computer can now be moved to another profile from any computer on the network, from its panel in the layout.
• Ctrl+Alt+Shift+P makes the computer you press it on the primary, and the key can be changed in Settings, under Hotkeys.
• Copy and paste now works on Wayland, in both directions.
• On a Mac on Wi-Fi, a banner now appears when AirDrop's wireless link is pausing Wi-Fi and making the mouse lag, suggesting an Ethernet cable first and offering to turn the link off.

Enhancements

• On Wayland, the desktop now asks for input capture permission once, rather than at every start.
• Linux downloads are now built on each distribution they are for: Debian 13, Ubuntu 26.04, Fedora 43, Fedora 44 and Arch Linux.
• When a newer version exists that this computer cannot install itself, Check for updates now says so and offers the download page.
• An update now deletes the version it replaced once nothing is running it, so old versions no longer build up on disk.
• Certificates now last 30 days and renew on their own, and their lifetime can be changed in Settings, under Security.
• With Synergy 1 computers allowed in Settings, under Compatibility, a Synergy 1 computer using TLS can now connect once you accept its certificate.
• Buttons now visibly press down when clicked, and Pause stays pressed until sharing has actually stopped.
• About now names the Deskflow version the Synergy Core is based on.

Bug fixes

Windows

• Restored AltGr on a Windows client, so characters such as @ and € type on layouts like German, and right Alt on a Windows server acts as Alt on other computers.
• Stopped a crash on Windows whenever sharing stopped or the background service quit.
• Stopped encrypted connections with a Windows computer failing because it never read the certificate fingerprints it had trusted.

macOS

• Stopped sharing never starting after installing on a Mac, where the status bar said Sharing is not installed and installing again did not help.

Linux and Wayland

• Stopped sharing failing to start on a Linux computer without Qt installed: the packages now bring the libraries it needs.
• Corrected installing the rpm on rpm-ostree systems such as Bazzite, Silverblue and Kinoite.
• Stopped a Fedora 43 computer agreeing on a primary and then sharing nothing.

All computers

• Stopped a computer that could not reach the old primary missing a change of primary: it now follows the new one within about ten seconds.
• Stopped quitting from the tray leaving the app unable to start: opening it again now starts the background service, or on a Mac offers to.
• Stopped the session agent being left running after quitting from the tray.
• Corrected the screen a computer shows once it is removed from a network: one banner saying so, with the controls that cannot work there turned off.
• Stopped a removed computer's card coming back as connecting, and a joining computer's card saying it is still connecting after it has joined.