Headroom compresses data before the data reaches a large language model. Prior to version 0.35.0, the Headroom WebSocket server does not validate the `Origin` header of incoming client WebSocket requests before forwarding the request to the upstream server, allowing malicious WebSocket clients to perform arbitrary LLM requests without authentication. This can be exploited by a malicious WebSocket client executed in a traditional or headless browser such as lightpanda, if the browser has access to the Headroom proxy and the OpenAI API key is stored in the `OPENAI_API_KEY` environment variable. Version 0.35.0 fixes the issue.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-h46j-26q3-rggf Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sun, 13 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Headroom Labs
Headroom Labs headroom
Vendors & Products Headroom Labs
Headroom Labs headroom

Fri, 11 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 11 Sep 2026 13:45:00 +0000

Type Values Removed Values Added
Description Headroom compresses data before the data reaches a large language model. Prior to version 0.35.0, the Headroom WebSocket server does not validate the `Origin` header of incoming client WebSocket requests before forwarding the request to the upstream server, allowing malicious WebSocket clients to perform arbitrary LLM requests without authentication. This can be exploited by a malicious WebSocket client executed in a traditional or headless browser such as lightpanda, if the browser has access to the Headroom proxy and the OpenAI API key is stored in the `OPENAI_API_KEY` environment variable. Version 0.35.0 fixes the issue.
Title Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)
Weaknesses CWE-1385
CWE-287
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-11T14:33:18.586Z

Reserved: 2026-08-06T16:28:51.181Z

Link: CVE-2026-71416

cve-icon Vulnrichment

Updated: 2026-09-11T14:32:23.039Z

cve-icon NVD

Status : Deferred

Published: 2026-09-11T14:17:32.390

Modified: 2026-09-30T19:57:08.043

Link: CVE-2026-71416

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T19:15:14Z

Weaknesses