Resource exhaustion in Unclecode Crawl4ai
CVE-2026-91941
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/unclecode/crawl4ai/security/advisories/GHSA-v2rm-hvrj-2x9q (vendor-advisory)
- www.vulncheck.com/advisories/crawl4ai-before-0.9.3-denial-of-service-via-pdfcon… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91941?
- CVE-2026-91941 is a high-severity vulnerability in Unclecode Crawl4ai, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-91941?
- High severity. CVSS v3 base score is 7.5 out of 10.