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Researcher says Tailscale SSH can turn one hacked node into root
A Cyberdione Labs report says a compromised device with Tailscale SSH port forwarding can reach root on other reachable servers; Tailscale has no patch and is not telling users to disable SSH, The Hacker News reported.
A single compromised device on a Tailscale network can be used to gain root on other servers it is allowed to reach, according to a lab report published this week and summarized by The Hacker News1.
The attack described needs Tailscale SSH configured to allow port forwarding and an attacker who already controls a device that access rules permit to connect to the target1. Tailscale SSH identifies the device rather than checking a password or key, so the report says no stolen credentials are required after that first foothold1.
Erica Windisch of Cyberdione Labs published the findings Oct. 25 as Tailworm, after testing Tailscale 1.104.2 and headscale 0.29.5 in a lab1. The Hacker News said the tests were not attacks on real networks1. As of publication, Tailscale had issued no security bulletin, CVE identifier or fixed release1.
Mike Shaver, Tailscale’s vice president of engineering, wrote on Reddit that the company had received the report, had already been examining the same areas with outside specialists, and had found issues it is working to fix1. Shaver said Tailscale is still determining which setups are affected and is not recommending that everyone disable Tailscale SSH1.
On Tailscale’s hosted service, forwarding can be switched off per rule; on headscale 0.29.5, the report says forwarding cannot be turned off, so every SSH grant there should be treated as root on the target1. Windisch described the result as wormable in the lab; some researchers who read the report have questioned that label, The Hacker News said1.
The SSH finding is one of 11 in the report1. Windisch wrote that the work was reported but not coordinated; at least one commenter called publishing without first reporting to Tailscale irresponsible1. No other researcher has publicly reproduced the claims, and Tailscale has not confirmed the specific technical details1. Earlier in 2026, Tailscale fixed related SSH and socket-handling issues in version 1.98.91.
Without a patch, The Hacker News listed configuration steps that overlap Tailscale’s advice: tighten SSH grants to named source-destination pairs, disable forwarding where possible, and enable node-key expiry1. Whether the lab chains work on production networks remains unverified1.
