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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.

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之前版本存在资源管理错误漏洞，该漏洞源于PDFContentScrapingStrategy存在不受控的资源消耗，攻击者可在POST请求中选择PDF抓取策略下载无大小和页数限制的大型远程PDF，耗尽共享工作节点的磁盘、CPU和带宽，导致拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P42

Possible ATT&CK Techniques 2 AI

T1273 T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.9.3 affected
0.9.3 unaffected
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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
Vulnerability Title
UncleCode Crawl4AI 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于PDFContentScrapingStrategy存在不受控的资源消耗，攻击者可在POST请求中选择PDF抓取策略下载无大小和页数限制的大型远程PDF，耗尽共享工作节点的磁盘、CPU和带宽，导致拒绝服务。
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 ~ 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