TS-2023-007

Description: Microsoft Defender is flagging Tailscale 1.46.1 as malware. These classifications are false positives, and we are working with Microsoft to resolve the situation. As of 2023-10-27 1:05 AM UTC, we have confirmed that Microsoft have addressed the false positive, meaning Defender no longer flags Tailscale 1.46.1 as malware. A rescan of tailscaled.exe 1.46.1 on VirusTotal confirms this. What happened? Microsoft Defender was flagging Tailscale 1.46.1 as malware. This caused Defender to quarantine the binaries, meaning they could not run. We submitted Tailscale 1.46.1 to Microsoft to investigate the false positive, who then updated Defender to avoid flagging this release as malware at 2023-10-27 1:05 AM UTC. Who is affected? People using Defender and Tailscale 1.46.1. What is the impact? Tailscale will not run on affected machines. What do I need to do? To resolve this issue on your own tailnet, you can take either or both of 2 approaches: Update to a newer version of Tailscale. Newer versions are not affected by this problem. Create an exception in Microsoft Defender. Microsoft has published instructions explaining how to do this. Update Microsoft Defender.