CVE-2026-56266 | Crawl4AI before 0.8.7 contains a server-side request forgery… | CVSS 8.6 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.

Metadata

CVE ID: CVE-2026-56266
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 01:42 UTC
Published: 2026-06-22 21:04 UTC
Last updated: 2026-06-22 21:04 UTC
Primary CWE: CWE-918
Server-Side Request Forgery (SSRF)
Vendor / Product: Crawl4AI / Crawl4AI
Sources: cve.org · NVD

Severity & Metrics

8.6 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
Crawl4AI	Crawl4AI	—	0 < 0.8.7, 0.8.7

Weakness (CWE)

CWE	Source	Description
CWE-918	cna	Server-Side Request Forgery (SSRF)

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.2	CRITICAL	4.0	cna	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
8.6	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References (3)

https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg
https://github.com/unclecode/crawl4ai https://github.com/unclecode/crawl4ai
VulnCheck Advisory: Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints https://www.vulncheck.com/advisories/crawl4ai-server-side-request-forgery-via-direct-crawl-endpoints