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CVE-2026-71416 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf	CISA-ADP
https://github.com/headroomlabs-ai/headroom/releases/tag/v0.35.0	[email protected]
https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1385	Missing Origin Validation in WebSockets	[email protected]
CWE-287	Improper Authentication	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 11, 2026	CVE Modified	CISA-ADP
Sep 11, 2026	New CVE Received	[email protected]