What is CVE-2026-91943?

CVE-2026-91943 is a high-severity vulnerability in Unclecode Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-15.

How severe is CVE-2026-91943?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Unclecode Crawl4ai

CVE-2026-91943

Crawl4AI before 0.9.3 contains a server-side request forgery vulnerability in PDFContentScrapingStrategy where _get_pdf_path() re-downloads targets with Python requests without egress validation. Authenticated attackers can supply URLs that redirect to internal addresses or use DNS rebinding to access internal services, exfiltrating responses through PDF text extraction in crawl results.

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Unclecode Crawl4ai

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91943?: CVE-2026-91943 is a high-severity vulnerability in Unclecode Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-15.
How severe is CVE-2026-91943?: High severity. CVSS v3 base score is 7.7 out of 10.