CVE-2026-57571
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.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.6
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS probability
- 0.81%
- CWE
- CWE-22, CWE-59
- Published
- 2026-07-06
- Last modified
- 2026-07-08
Affected products
- unclecode crawl4ai
Weakness type
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