CVE-2026-91941
Received Received - Intake

Uncontrolled Resource Consumption in Crawl4AI PDF Scraping

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

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.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91941
EUVD
EUVD-2026-78798

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

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Executive Summary

Crawl4AI before version 0.9.3 has an uncontrolled resource consumption vulnerability in the PDFContentScrapingStrategy component. This flaw allows untrusted clients to trigger denial of service by sending POST requests to select PDF scraping. Attackers can download large remote PDF files without any size or page limits, which consumes excessive disk space, CPU, and bandwidth on shared workers.

Detection Guidance

Monitor network traffic for excessive PDF downloads or unusual POST requests targeting Crawl4AI endpoints. Check system resource usage for sudden spikes in CPU, disk I/O, or bandwidth consumption. Inspect logs for repeated requests with large PDF URLs or the PDF scraping strategy selection.

Impact Analysis

This vulnerability can lead to denial of service for systems running affected versions of Crawl4AI. It may cause system slowdowns, crashes, or unavailability due to resource exhaustion. Shared environments or services relying on Crawl4AI could experience degraded performance or complete downtime.

Mitigation Strategies

Upgrade Crawl4AI to version 0.9.3 or later to address the uncontrolled resource consumption. Implement rate limiting and size limits for PDF downloads in the application configuration. Block or filter requests selecting the PDF scraping strategy if not required.

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