CVE-2026-57571: Kidocode CRAWL4AI

Critical severity, CVSS 9.6. EPSS: 0.8% chance of exploitation in the next 30 days.

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

• Kidocode CRAWL4AI: before 0.9.0 (fixed in 0.9.0)

Published 2026-07-06. Last modified 2026-07-07.