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Vulnerability record · CVE-2026-71416 · published 11 September 2026

CVE-2026-71416: Improper authentication vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.22% · top 88.9% CWE-287 · Improper authenticationCWE-1385 · CWE-1385 Received
8.8CVSS 3.1 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
11 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/headroomlabs-ai/headroom/releases/tag/v0.35.0
https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf
https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf

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Source: NIST National Vulnerability Database (record CVE-2026-71416), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.