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

Quick assessment

Affected
unclecode crawl4ai
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.9.0之前版本存在安全漏洞，该漏洞源于当爬虫保存下载文件时，目标文件名取自攻击者影响的输入并与下载目录拼接，文件名包含绝对路径或路径遍历，从而允许任意文件写入，由于写入内容可被攻击者控制，这可能导致远程代码执行。

CVSS 9.6 · Critical EPSS 0.81% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.9.0 affected
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I. Basic Information for CVE-2026-57571

Vulnerability Information
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Vulnerability Title
Crawl4AI arbitrary file write via download filename path traversal
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
UncleCode Crawl4AI 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.9.0之前版本存在安全漏洞，该漏洞源于当爬虫保存下载文件时，目标文件名取自攻击者影响的输入并与下载目录拼接，文件名包含绝对路径或路径遍历，从而允许任意文件写入，由于写入内容可被攻击者控制，这可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
unclecode crawl4ai < 0.9.0 -

II. Public POCs for CVE-2026-57571

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 17145 chars
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III. Intelligence Information for CVE-2026-57571

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Patches & Fixes for CVE-2026-57571 (1)

Vendor Advisories for CVE-2026-57571 (1)

Same Patch Batch · unclecode · 2026-07-06 · 3 CVEs total

CVE-2026-57572 10.0 CRITICAL Crawl4AI: Unauthenticated RCE via Chromium launch-argument injection in browser_config.ext
CVE-2026-57573 8.6 HIGH Crawl4AI unauthenticated SSRF in Docker streaming crawl endpoint

IV. Related Vulnerabilities

Same product: crawl4ai
Same vendor: unclecode
Same weakness: CWE-22

V. Comments for CVE-2026-57571

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