What is CVE-2026-56266?

CVE-2026-56266 is a high-severity vulnerability in Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-06-22.

How severe is CVE-2026-56266?

High severity. CVSS v3 base score is 8.6 out of 10.

SSRF in Crawl4ai

CVE-2026-56266

Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md, and /llm endpoints that fetch arbitrary user-supplied URLs without validation. Unauthenticated attackers can bypass the internal-…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.005 (38.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Crawl4ai — versions 0, 0.8.7
Kidocode Crawl4ai

Weakness classification (CWE)

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

References

https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg (vendor-advisory, Mitigation, Vendor Advisory)
https://github.com/unclecode/crawl4ai (Product, product)
VulnCheck Advisory: Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-56266?: CVE-2026-56266 is a high-severity vulnerability in Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-06-22.
How severe is CVE-2026-56266?: High severity. CVSS v3 base score is 8.6 out of 10.