CVE-2026-55883 Tilt: Cross-site WebSocket hijacking of the Tilt HUD stream
An attacker can hijack the Tilt HUD WebSocket to read sensitive session and configuration data if the interface is network-exposed.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55883?
CVE-2026-55883 is a high-severity vulnerability in tilt-dev tilt, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tilt defines dev environments as code for microservice apps on Kubernetes. From 0.24.0 through 0.37.3, the Tilt HUD WebSocket at /ws/view is gated by a CSRF token, but the token is served by the unauthenticated /api/websocket_token endpoint and the upgrader accepts clients that omit an Origin header. When the HUD is network-exposed, an attacker who can reach the listener can open the HUD WebSocket and receive the full view stream, including session state, Tiltfile contents, resource statuses, and continued updates. This issue is fixed in version 0.37.4.
Weakness: CWE-345
Which versions are affected by CVE-2026-55883?
3 open source packages ship an affected version, including github.com/tilt-dev/tilt.
| Package | Affected | Fixed in |
|---|---|---|
github.com/tilt-dev/tilt Go | From 0.24.0 | 0.37.4 |
github.com/tilt-dev/tilt Go | From 0.24.0 | 0.37.4 |
github.com/tilt-dev/tilt Go | From 0.24.0 | 0.37.4 |
How do I fix CVE-2026-55883?
Upgrade github.com/tilt-dev/tilt to 0.37.4 or later.
Is CVE-2026-55883 being exploited?
There is no known exploitation of CVE-2026-55883 in the wild and no public exploit code.
Sources
Also known as GHSA-6m68-r693-78qx, GO-2026-5181.