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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.

Crawl4AI 在 0.9.3 版本之前存在任意文件写入漏洞，位于 模块中。具体原因是 函数未能对不可信的配置文件字段进行充分验证。攻击者可以提交经过精心构造的配置文件，利用恶意的 路径，将攻击者控制的字节写入服务账户可访问的任意目录。

CVSS 7.5 · High
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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

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

V. Comments for CVE-2026-91940

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