CVE-2026-71416: Headroom compresses data before the data reaches a large language model. Prior to version 0.35.0, th…
- Occurred
- Sep 11, 2026
- Published
- Sep 11, 2026
- Source
- NVD CVE
Summary
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.
Tags
- CVE
- CVE-2026-71416
- cvss:HIGH
Classification
Rationale: Unvalidated Origin header allows unauthorized API key access and potential data exfiltration via LLM requests.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8