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CVE-2026-71416— Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)

Quick assessment

Affected
headroomlabs-ai headroom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Headroom 在数据到达大型语言模型（LLM）之前会对数据进行压缩。在 0.35.0 版本之前，Headroom 的 WebSocket 服务器在将请求转发给上游服务器之前，未对传入的客户端 WebSocket 请求的 头进行验证，这使得恶意的 WebSocket 客户端能够在没有身份验证的情况下发起任意的 LLM 请求。如果恶意 WebSocket 客户端在传统浏览器或无头浏览器（如 lightpanda）中运行，且该浏览器能够访问 Headroom 代理，并且 OpenAI API 密钥存储在 环境变量中，

CVSS 8.8 · High
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I. Basic Information for CVE-2026-71416

Vulnerability Information
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Vulnerability Title
Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
headroomlabs-ai headroom < 0.35.0 -

II. Public POCs for CVE-2026-71416

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III. Intelligence Information for CVE-2026-71416

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Vendor Advisories for CVE-2026-71416 (1)

Vendor Pages for CVE-2026-71416 (1)

IV. Related Vulnerabilities

Same product: headroom
Same weakness: CWE-287

V. Comments for CVE-2026-71416

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