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GHSA-5882-5rx9-xgxp

CriticalCVSS 10 / 10
Published Jan 16, 2026·Last modified Feb 22, 2026
Affected Components(0)

No affected components available

Description

A critical remote code execution vulnerability exists in the Crawl4AI Docker API deployment. The /crawl endpoint accepts a hooks parameter containing Python code that is executed using exec(). The __import__ builtin was included in the allowed builtins, allowing attackers to import arbitrary modules and execute system commands.

Attack Vector:

POST /crawl
{
  "urls": ["https://example.com"],
  "hooks": {
    "code": {
      "on_page_context_created": "async def hook(page, context, **kwargs):\n    __import__('os').system('malicious_command')\n    return page"
    }
  }
}

Impact

An unauthenticated attacker can:

  • Execute arbitrary system commands
  • Read/write files on the server
  • Exfiltrate sensitive data (environment variables, API keys)
  • Pivot to internal network services
  • Completely compromise the server

Mitigation

  1. Upgrade to v0.8.0 (recommended)
  2. If unable to upgrade immediately:
    • Disable the Docker API
    • Block /crawl endpoint at network level
    • Add authentication to the API

Fix Details

  1. Removed __import__ from allowed_builtins in hook_manager.py
  2. Hooks disabled by default (CRAWL4AI_HOOKS_ENABLED=false)
  3. Users must explicitly opt-in to enable hooks

Credits

Discovered by Neo by ProjectDiscovery (https://projectdiscovery.io)

Risk Scores
Base Score
10.0

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
9.1

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
1.59%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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