critical9.6
CVE-2026-57571
Crawl4AI is an open-source LLM-friendly web crawler and scraper.
Impact
Crawl4AI is an open-source LLM-friendly web crawler and scraper. Prior to 0.9.0, when the crawler saves a downloaded file, the destination filename was taken from attacker-influenced input and joined to the downloads directory with no confinement. A filename containing an absolute path or traversal escaped the downloads directory, giving an arbitrary file write with attacker-controlled contents; the HTTP crawler path uses the response Content-Disposition filename and the browser crawler path uses the download's suggested filename. Because the written bytes are attacker-controlled, this can escalate to remote code execution. This issue is fixed in version 0.9.0.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kidocode | Crawl4ai | before 0.9.0 |