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` 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 v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 14:17

Updated : 2026-09-11 15:17

NVD link : CVE-2026-71416

Mitre link : CVE-2026-71416

CVE.ORG link : CVE-2026-71416

JSON object : View

Products Affected

No product.

CWE

CWE-287

Improper Authentication

CWE-1385

Missing Origin Validation in WebSockets

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