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-address blocklist using IPv6-mapped IPv4 addresses to reach internal services and cloud metadata endpoints.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/unclecode/crawl4ai	Product
https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/crawl4ai-server-side-request-forgery-via-direct-crawl-endpoints	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:kidocode:crawl4ai:*:*:*:*:*:*:*:*

History

25 Oct 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) Crawl4AI antes de 0.8.7 contiene una vulnerabilidad de falsificación de petición del lado del servidor en los puntos finales /crawl, /crawl/stream, /md y /llm que recuperan URLs arbitrarias proporcionadas por el usuario sin validación. Atacantes no autenticados pueden eludir la lista negra de direcciones internas utilizando direcciones IPv4 mapeadas a IPv6 para alcanzar servicios internos y puntos finales de metadatos en la nube.

Information

Published : 2026-06-22 22:16

Updated : 2026-10-25 23:10

NVD link : CVE-2026-56266

Mitre link : CVE-2026-56266

CVE.ORG link : CVE-2026-56266

JSON object : View

Products Affected

kidocode

crawl4ai

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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