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Crawl4AI CVE-2026-56264

| EUVDEUVD-2026-40431 CRITICAL
Code Injection (CWE-94)
2026-06-30 VulnCheck GHSA-g2pv-76hm-j4x9
Code Injection SSRF Docker RCE Crawl4ai
9.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.2 CRITICAL
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/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
vuln.today AI
8.1 HIGH

Unauthenticated network endpoint executes attacker JavaScript (PR:N), but high complexity (AC:H) reflects the dependence on an exposed Docker server and reachable internal targets; full code-execution impact gives C/I/A:H.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/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
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jul 01, 2026 - 02:16 EUVD
Analysis Generated
Jun 30, 2026 - 23:24 vuln.today
CVE Published
Jun 30, 2026 - 22:08 cve.org
CRITICAL 9.2

DescriptionCVE.org

Crawl4AI before 0.8.7 contains an arbitrary JavaScript execution vulnerability in the Docker API server's /execute_js endpoint, which accepts and executes arbitrary user-supplied JavaScript in the server's browser context with --disable-web-security enabled. An attacker can execute arbitrary JavaScript and, combined with the browser's relaxed security settings, perform server-side request forgery against internal services.

Articles & Coverage 1

News Critical Arbitrary JS Execution in Crawl4AI Docker API - CVE-2026-56264 Jul 01, 2026

AnalysisAI

Arbitrary JavaScript execution in Crawl4AI's Docker API server (versions before 0.8.7) lets remote attackers submit code to the /execute_js endpoint, which runs it inside the server's Chromium browser context launched with --disable-web-security. Because the browser's same-origin and CORS protections are disabled, attacker-controlled JavaScript can pivot into server-side request forgery against internal services and metadata endpoints. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed Docker API server
Delivery
POST JavaScript to /execute_js
Exploit
Code runs in --disable-web-security browser
Execution
Issue cross-origin SSRF to internal services
Impact
Read responses, exfiltrate internal data
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the Crawl4AI Docker API server be deployed and network-reachable by the attacker, and that the vulnerable /execute_js endpoint be exposed; the browser must be running with the --disable-web-security setting (the default for this server) for the SSRF pivot to succeed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and worth weighing carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach an internet-exposed Crawl4AI Docker API server sends a crafted HTTP request to /execute_js containing JavaScript that issues fetches to internal endpoints (e.g., a cloud metadata service or an internal admin API). Because the browser runs with web security disabled, those cross-origin responses are readable, letting the attacker exfiltrate internal data or interact with services the server can reach. …
Remediation Upgrade to Crawl4AI 0.8.7 or later, the vendor-released patched version, as the primary fix (see advisory https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Identify all Crawl4AI deployments, restrict network access to the API server, and block the /execute_js endpoint via firewall or WAF; review recent logs for exploitation activity. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-56264 vulnerability details – vuln.today
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