Vulnerability · Published Jun 22, 2026 · Assigned by VulnCheck

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

High 8.6

In plain English

A high-severity server-side request forgery in Crawl4AI from Crawl4AI. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.5%top 58.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	crawl4ai	0.8.7	GHSA-365w-hqf6-vxfg
PyPI	crawl4ai	0.8.7	GHSA-8qrg-7j2f-rf2h
PyPI	crawl4ai	0.8.7	PYSEC-2026-229
PyPI	crawl4ai	0.8.7	PYSEC-2026-230
PyPI	crawl4ai	0.8.7	PYSEC-2026-239
PyPI	crawl4ai	0.8.7	PYSEC-2026-3443
PyPI	crawl4ai	0.8.7	PYSEC-2026-3449
PyPI	crawl4ai	0.8.7	PYSEC-2026-596
PyPI	crawl4ai	0.8.7	PYSEC-2026-798

Affected products (as reported)

Vendor	Product	Versions
Crawl4AI	Crawl4AI	0 – before 0.8.7

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References

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