CVE-2026-56266

High

Description

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.

SeverityHigh

CVSS8.6

Exploit probability—

ProductKidocode Crawl4ai

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

kidocode crawl4ai0.8.7 or later

Vendor advisories

github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg

Affected products

Product	Affected versions	Fixed in
kidocode crawl4ai	v < 0.8.7	0.8.7

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