Improper Control of Dynamically-Managed Code Resources Affecting crawl4ai package, versions [,0.8.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-CRAWL4AI-17661139
- published28 Jun 2026
- disclosed16 Jun 2026
- creditUnknown
Introduced: 16 Jun 2026
NewCVE-2026-53753 (opens in a new tab)How to fix?
Upgrade Crawl4AI to version 0.8.7 or higher.
Overview
Crawl4AI is a 🚀🤖 Crawl4AI: Open-source LLM Friendly Web Crawler & scraper
Affected versions of this package are vulnerable to Improper Control of Dynamically-Managed Code Resources via the _safe_eval_expression function. An attacker can execute arbitrary system commands, read or write files, and exfiltrate sensitive data by sending a crafted extraction schema in a POST /crawl request that leverages Python generator and frame object attributes to escape the AST sandbox and achieve code execution. This is only exploitable if JWT authentication is disabled (the default configuration).
Workaround
This vulnerability can be mitigated by enabling JWT authentication via the CRAWL4AI_API_TOKEN environment variable or restricting network access to the Docker API.