{"id":"CVE-2026-71416","title":"Headroom compresses data before the data reaches a large language model","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 …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-287","CWE-1385"],"vendor":"headroomlabs-ai","product":"headroom","affected":["headroom < 0.35.0"],"published":"2026-09-11","updated":"2026-09-11","sourceUpdated":"2026-09-11T15:17:03.373","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71416","references":[{"url":"https://github.com/headroomlabs-ai/headroom/releases/tag/v0.35.0","label":"security-advisories@github.com"},{"url":"https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf","label":"security-advisories@github.com"},{"url":"https://github.com/headroomlabs-ai/headroom/security/advisories/GHSA-h46j-26q3-rggf","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-11T14:31:54.198576Z"},"ingestedAt":"2026-09-12T13:45:54.272Z","epss":0.00174,"epssPercentile":0.07103,"slug":"CVE-2026-71416","body":"## Overview\n\nHeadroom 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":60,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}