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…

PriorityP358critical9.6CVSS 3.1

AVNACLPRNUIRSCCHIHAH

EPSS

0.81%

56.1th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
kidocode	crawl4ai	< 0.9.0	0.9.0
unclecode	crawl4ai	< 0.9.0	0.9.0

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