{"id":"CVE-2026-55884","aliases":["GHSA-c73q-8xxr-rgqm","GO-2026-5317"],"url":"https://o3.security/vulnerability/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.","published":"2026-07-10T21:36:18.861Z","modified":"2026-08-12T03:51:30.612414116Z","cvss":null,"epss":{"score":0.00496,"percentile":0.41434,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/tilt-dev/tilt","fixedVersion":"0.37.4"}],"fix":{"url":"https://github.com/tilt-dev/tilt/commit/47393fba7f6ef5e305d5e814551feef8e4acbc0a","label":"tilt-dev/tilt@47393fb"},"references":[{"type":"WEB","url":"https://github.com/tilt-dev/tilt/releases/tag/v0.37.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55884.json"},{"type":"ADVISORY","url":"https://github.com/tilt-dev/tilt/security/advisories/GHSA-c73q-8xxr-rgqm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55884"},{"type":"FIX","url":"https://github.com/tilt-dev/tilt/commit/47393fba7f6ef5e305d5e814551feef8e4acbc0a"},{"type":"FIX","url":"https://github.com/tilt-dev/tilt/pull/6776"},{"type":"PACKAGE","url":"https://github.com/tilt-dev/tilt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:30.612414116Z"}}