HIGH 8.8 NVD
CVE-2026-71416
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` h
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.
References
- 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
This high severity vulnerability with a CVSS score of 8.8 was published on 2026-09-11 via NVD.
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