CVE-2026-56266: Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-10-25
Weakness: CWE-918

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.

Affected products

unclecode crawl4ai: before 0.8.7 — fixed in 0.8.7

How to fix

Upgrade to a fixed version: unclecode crawl4ai 0.8.7. Check the vendor advisory for mitigations.

References

https://github.com/unclecode/crawl4ai
https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg
https://www.vulncheck.com/advisories/crawl4ai-server-side-request-forgery-via-direct-crawl-endpoints

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