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CVE-2026-56258— Crawl4AI - Arbitrary File Write via output_path Symlink and TOCTOU

Quick assessment

Affected
Crawl4AI 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 0.8.8之前版本存在路径遍历漏洞，该漏洞源于screenshot和PDF端点中output_path参数路径验证不充分和符号链接跟随问题，可能导致未经身份验证的攻击者通过符号链接和TOCTOU攻击将文件写入预期目录之外，从而实现任意文件写入以及潜在代码执行。

CVSS 8.1 · High EPSS 0.91% · P59

Affected Version Matrix 2

VendorProduct Version RangeStatus
Crawl4AI Crawl4AI < 0.8.8 affected
0.8.8 unaffected
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I. Basic Information for CVE-2026-56258

Vulnerability Information
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Vulnerability Title
Crawl4AI - Arbitrary File Write via output_path Symlink and TOCTOU
Source: CVE Program / CVE List V5
Vulnerability Description
Crawl4AI before 0.8.8 contains an arbitrary file write vulnerability in the screenshot and PDF endpoints that allows unauthenticated attackers to write files outside the intended directory via symlink and time-of-check-time-of-use (TOCTOU) attacks on the output_path parameter. Remote attackers can exploit insufficient path validation and symlink following to achieve arbitrary file write and potential code execution on systems where the runtime user has write access to executable or cron locations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/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 0.8.8之前版本存在路径遍历漏洞，该漏洞源于screenshot和PDF端点中output_path参数路径验证不充分和符号链接跟随问题，可能导致未经身份验证的攻击者通过符号链接和TOCTOU攻击将文件写入预期目录之外，从而实现任意文件写入以及潜在代码执行。
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
Crawl4AI Crawl4AI 0 ~ 0.8.8 -

II. Public POCs for CVE-2026-56258

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8631 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-56258

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Vendor Advisories for CVE-2026-56258 (2)

IV. Related Vulnerabilities

Same product: Crawl4AI
Same vendor: Crawl4AI
Same weakness: CWE-22

V. Comments for CVE-2026-56258

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