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Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-71416
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 18:03 UTC · Revision 1

Source evidence

Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)

core-osv · Original source

Published 11 Sept 2026, 13:34 UTC

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.

osv:CVE-2026-71416
Complete source record
{
  "id": "1a93007b9f8be6f93de0b68e8637c4f1798ca7803b19ee312f9a49bdba47cfa9",
  "url": "https://osv.dev/vulnerability/CVE-2026-71416",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)",
    "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.",
    "evidence": "osv:CVE-2026-71416",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-71416",
      "aliases": [
        "CVE-2026-71416",
        "GHSA-h46j-26q3-rggf",
        "PYSEC-2026-4220"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/headroomlabs-ai/headroom",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "93f2d7a2da4d3b6c88f31bad164ae299cf042104"
                }
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              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
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                        "fixed": "0.35.0"
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                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "93f2d7a2da4d3b6c88f31bad164ae299cf042104"
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                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.35.0"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.35.0"
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                    "source": "DESCRIPTION"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71416.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.027918084Z",
      "provider": "osv",
      "references": [
        "https://github.com/headroomlabs-ai/headroom/releases/tag/v0.35.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71416.json",
        "https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-71416"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1385",
          "CWE-287"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71416.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-71416",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498130,
  "published_at": "2026-09-11T13:34:38.794+00:00"
}