What’s Vulnerable › Vulnerabilities

CVE-2026-57571: Crawl4AI arbitrary file write via download filename path traversal

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-06 · updated 2026-10-25
• Weakness: CWE-22

Description

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

• unclecode crawl4ai: before 0.9.0 — fixed in 0.9.0

How to fix

Upgrade to a fixed version: unclecode crawl4ai 0.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/unclecode/crawl4ai/commit/60886d1a0c52682e4c83a7cef9dfac417fff6bd2
• https://github.com/unclecode/crawl4ai/security/advisories/GHSA-2jq4-q6vv-4cp3

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