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CVE-2026-91941— Crawl4AI before 0.9.3 Denial of Service 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 版本之前存在一个不可控资源消耗漏洞，位于 PDFContentScrapingStrategy 组件中，使得不受信任的客户端能够引发服务拒绝（DoS）攻击。攻击者可以在 POST 请求中指定使用 PDF 抓取策略，从而下载体积巨大的远程 PDF 文件，且未对文件大小或页数设置任何限制，最终耗尽共享工作节点（shared workers）的磁盘空间、CPU 资源和网络带宽。

CVSS 7.5 · High

Possible ATT&CK Techniques 2 AI

T1273 T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-91941

Vulnerability Information
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Vulnerability Title
Crawl4AI before 0.9.3 Denial of Service via PDFContentScrapingStrategy
Source: CVE Program / CVE List V5
Vulnerability Description
Crawl4AI before 0.9.3 contains an uncontrolled resource consumption vulnerability in PDFContentScrapingStrategy that allows untrusted clients to cause denial of service. Attackers can select the PDF scraping strategy in POST requests to download large remote PDFs without size or page limits, exhausting disk, CPU, and bandwidth on shared workers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
unclecode crawl4ai 0 ~ 0.9.3 -

II. Public POCs for CVE-2026-91941

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III. Intelligence Information for CVE-2026-91941

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Vendor Advisories for CVE-2026-91941 (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-2026-91940 7.5 HIGH crawl4ai before 0.9.3 Arbitrary File Write 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-400

V. Comments for CVE-2026-91941

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