CVE-2026-56266

critical · 9.2

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.

9.2

CVSS

0.5%

EPSS (exploit prob.)

40th

EPSS percentile

2026-06-22

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-918

Affected products

Vendor	Product	Affected versions
kidocode	crawl4ai	< 0.8.7

Check a specific version with /api/v1/cve/match.

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-56266