Answer in brief
CVE-2026-71416 records a High severity (CVSS 8.8) vulnerability in Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH). The current sources do not mark it as known exploited. The current feed maps headroomlabs-ai/headroom (generic), headroom-ai (pip), headroom-ai (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps headroomlabs-ai/headroom (generic), headroom-ai (pip), headroom-ai (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| headroomlabs-ai/headroomgeneric | <0.35.0 | 0.35.0 |
| headroom-aipip | <0.35.0 | 0.35.0 |
| headroom-aipypi | >=0 <0.35.0 | 0.35.0 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.