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CVE-2026-91940— crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy

Quick assessment

Affected
unclecode crawl4ai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 0.9.3之前版本存在路径遍历漏洞，该漏洞源于PDFContentScrapingStrategy中的_filter_untrusted_fields函数未验证不可信配置字段，攻击者可提交带有恶意image_save_dir路径的特制配置内容，向服务账户可访问的任意目录写入攻击者控制的字节，导致任意文件写入。

CVSS 7.5 · High EPSS 0.46% · P40

Affected Version Matrix 2

VendorProduct Version RangeStatus
unclecode crawl4ai 0.9.0< 0.9.3 affected
0.9.3 unaffected
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I. Basic Information for CVE-2026-91940

Vulnerability Information
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Vulnerability Title
crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy
Source: CVE Program / CVE List V5
Vulnerability Description
crawl4ai before 0.9.3 contains an arbitrary file write vulnerability in PDFContentScrapingStrategy where the _filter_untrusted_fields function fails to validate untrusted configuration fields. Attackers can submit crafted config bodies with malicious image_save_dir paths to write attacker-controlled bytes into any directory accessible to the service account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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 0.9.3之前版本存在路径遍历漏洞，该漏洞源于PDFContentScrapingStrategy中的_filter_untrusted_fields函数未验证不可信配置字段，攻击者可提交带有恶意image_save_dir路径的特制配置内容，向服务账户可访问的任意目录写入攻击者控制的字节，导致任意文件写入。
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 ~ 0.9.3 -

II. Public POCs for CVE-2026-91940

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III. Intelligence Information for CVE-2026-91940

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Vendor Advisories for CVE-2026-91940 (2)

Same Patch Batch · unclecode · 2026-09-15 · 5 CVEs total

CVE-2026-91943 7.7 HIGH Crawl4AI before 0.9.3 SSRF via PDFContentScrapingStrategy
CVE-2026-91941 7.5 HIGH Crawl4AI before 0.9.3 Denial of Service via PDFContentScrapingStrategy
CVE-2026-91944 6.1 MEDIUM crawl4ai before 0.9.3 DOM-based XSS via Playground UI
CVE-2026-91942 5.4 MEDIUM crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML

IV. Related Vulnerabilities

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