Path Traversal in Kidocode Crawl4ai
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Kidocode Crawl4ai
- Unclecode Crawl4ai — versions < 0.9.0
Weakness classification (CWE)
References
- github.com/unclecode/crawl4ai/security/advisories/GHSA-2jq4-q6vv-4cp3 (Exploit, Mitigation, Vendor Advisory)
- github.com/unclecode/crawl4ai/commit/60886d1a0c52682e4c83a7cef9dfac417fff6bd2 (Patch)
Frequently asked questions
- What is CVE-2026-57571?
- CVE-2026-57571 is a critical-severity vulnerability in Kidocode Crawl4ai, classified under Path Traversal. CVSS score: 9.6/10. Published 2026-07-06.
- How severe is CVE-2026-57571?
- Critical severity. CVSS v3 base score is 9.6 out of 10.