CVE-2026-55884: Tilt Missing Authentication On The Network-exposed Vulnerability

CRITICAL
Advisory Identifier: GHSA-c73q-8xxr-rgqm
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CWE-306
Published
Advisory Summary

CVE-2026-55884 is a CRITICAL missing authentication on the network-exposed vulnerability (CWE-306: Missing Authentication for Critical Function) affecting Tilt libraries in the Go ecosystem. The issue involves missing authentication on the network-exposed tilt hud server. Remediation is available by upgrading affected packages to version 0.37.4.

CVE-2026-55884 at a Glance

CVE Identifier CVE-2026-55884
GHSA Identifier GHSA-c73q-8xxr-rgqm
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-306: Missing Authentication for Critical Function
Affected Product Tilt
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-55884

To remediate this vulnerability, upgrade all affected Tilt dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/tilt-dev/tilt fixed: 0.37.4 
Upgrade github.com/tilt-dev/tilt to 0.37.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/tilt-dev/tilt

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-55884, inspect your project dependencies for Tilt:

inspect dependencies for github.com/tilt-dev/tilt

Analyze the terminal output to locate any version of Tilt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.37.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-306: Missing Authentication for Critical Function, where the product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. In Tilt, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary The Tilt HUD HTTP server exposes state-changing and sensitive-read endpoints with no authentication. When the HUD is bound to a non-loopback address, a network attacker can trigger the developer's pre-defined Tiltfile resources, tamper with Tiltfile arguments, read full engine state including the session token, and reach the Tilt apiserver through a token-attaching proxy. ## Details The HUD server registers its handlers on a `gorilla/mux` router with no authenticating middleware. The `cookieWrapper` helper emits the `Tilt-Token` cookie but never validates it, and is attached only to the static-asset prefix. ## Impact An unauthenticated network caller can force any developer-defined resource to run on the host as the `tilt` user (choosing which and when, not the command text), set arbitrary Tiltfile arguments, disclose the session token and full engine state, and invoke apiserver resources via the loopback-token proxy. Because `tilt up` runs with the developer's privileges and credentials, the impact reaches the developer's environment and cluster. ### Conditions for exploitation - Affected version in `>= 0.20.8, <= 0.37.3`. - HUD bound to a non-loopback address (`tilt up --host 0.0.0.0`, or `TILT_HOST` set). - Network reachability to the listener (default port `10350`). ### Not affected - The default loopback-only bind is not reachable from the network. ## Workarounds Use the default loopback bind (omit `--host`, unset `TILT_HOST`) and ensure nothing else proxies to `localhost:10350`. No complete workaround short of upgrading for non-loopback deployments.

CVE-2026-55884 Affected Tilt Versions

1 component(s)
Fixed Versions:
0.37.4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/tilt-dev/tilt
golang/github.com/tilt-dev/tilt
Go
≥ 0.20.8
< 0.37.4
0.37.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/tilt-dev/tilt/security/advisories/GHSA-c73q-8xxr-rgqm
Tilt Source Repository REPOSITORY
https://github.com/tilt-dev/tilt/pull/6776
Tilt Source Repository REPOSITORY
https://github.com/tilt-dev/tilt
Tilt Release RELEASE
https://github.com/tilt-dev/tilt/releases/tag/v0.37.4

Frequently Asked Questions

What is CVE-2026-55884?
CVE-2026-55884 is a security vulnerability in Tilt involving Missing authentication on the network-exposed Tilt HUD server under CWE-306: Missing Authentication for Critical Function.
Which Tilt versions are affected?
Affected versions include releases prior to 0.37.4 across affected packages: github.com/tilt-dev/tilt.
What version fixes CVE-2026-55884?
Upgrading to 0.37.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/tilt-dev/tilt affected?
Yes, github.com/tilt-dev/tilt is affected in releases prior to 0.37.4. Upgrade your dependency to 0.37.4 or later.
What CWE is associated with CVE-2026-55884?
CVE-2026-55884 is classified under CWE-306: Missing Authentication for Critical Function (The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.).
How can I check Go dependencies for CVE-2026-55884?
Run the dependency tree command: 'inspect dependencies for github.com/tilt-dev/tilt'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c73q-8xxr-rgqm",
  "modified" : "2026-06-19T13:58:13Z",
  "published" : "2026-06-19T13:58:13Z",
  "aliases" : [ "CVE-2026-55884" ],
  "summary" : "Tilt: Missing authentication on the network-exposed Tilt HUD server",
  "details" : "## Summary\nThe Tilt HUD HTTP server exposes state-changing and sensitive-read endpoints with no authentication. When the HUD is bound to a non-loopback address, a network attacker can trigger the developer's pre-defined Tiltfile resources, tamper with Tiltfile arguments, read full engine state including the session token, and reach the Tilt apiserver through a token-attaching proxy.\n\n## Details\nThe HUD server registers its handlers on a `gorilla/mux` router with no authenticating middleware. The `cookieWrapper` helper emits the `Tilt-Token` cookie but never validates it, and is attached only to the static-asset prefix.\n\n## Impact\nAn unauthenticated network caller can force any developer-defined resource to run on the host as the `tilt` user (choosing which and when, not the command text), set arbitrary Tiltfile arguments, disclose the session token and full engine state, and invoke apiserver resources via the loopback-token proxy. Because `tilt up` runs with the developer's privileges and credentials, the impact reaches the developer's environment and cluster.\n\n### Conditions for exploitation\n- Affected version in `>= 0.20.8, <= 0.37.3`.\n- HUD bound to a non-loopback address (`tilt up --host 0.0.0.0`, or `TILT_HOST` set).\n- Network reachability to the listener (default port `10350`).\n\n### Not affected\n- The default loopback-only bind is not reachable from the network.\n\n## Workarounds\nUse the default loopback bind (omit `--host`, unset `TILT_HOST`) and ensure nothing else proxies to `localhost:10350`. No complete workaround short of upgrading for non-loopback deployments.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/tilt-dev/tilt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.20.8"
      }, {
        "fixed" : "0.37.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.37.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/tilt-dev/tilt/security/advisories/GHSA-c73q-8xxr-rgqm"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tilt-dev/tilt/pull/6776"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tilt-dev/tilt"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tilt-dev/tilt/releases/tag/v0.37.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T13:58:13Z",
    "nvd_published_at" : null
  }
}