CVE-2026-57572: unclecode Crawl4AI remote code execution in Docker API server

CVE-2026-57572 · Severity: critical · CVSS 10 · Published 2026-07-06

Crawl4AI is an open-source tool used to crawl and scrape websites for use with Large Language Models (LLMs). A critical security flaw in its Docker API server allows an unauthenticated attacker to execute arbitrary commands on the underlying system. This could lead to a total compromise of the server, including the theft of sensitive data, access to environment secrets, and the ability to use the infrastructure for further attacks.

Technologies: crawl4ai (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-57572 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-57572 being exploited in the wild.
How severe is CVE-2026-57572?
Critical severity, with a CVSS score of 10, published 6 July 2026.
Which products and versions are affected?
crawl4ai (PyPI) ECOSYSTEM:introduced=0,fixed=0.9.0.
Is there a fix for CVE-2026-57572?
Yes. crawl4ai (PyPI): upgrade to 0.9.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57572 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-57572?
Check whether you run crawl4ai (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • crawl4ai (PyPI): upgrade to 0.9.0 or later
    pip install "crawl4ai>=0.9.0"

Technical details

The vulnerability is an argument injection flaw (CWE-88) in the Docker API server's handling of the 'browser_config.extra_args' field. Because the API is unauthenticated by default, a remote attacker can send a crafted request to endpoints like /crawl or /crawl/stream containing malicious Chromium switches (such as --utility-cmd-prefix or --renderer-cmd-prefix) combined with --no-zygote. This causes the underlying Chromium process to execute attacker-controlled commands as the container's runtime user. While version 0.8.9 attempted to mitigate this with a denylist, it was incomplete; version 0.9.0 fixes the issue by establishing a proper trust boundary and rejecting requests that attempt to use these sensitive configuration fields.

Affected products

  • unclecode crawl4ai < 0.9.0

Identifiers

  • CVE-2026-57572
  • GHSA-r253-r9jw-qg44
  • PYSEC-2026-2139

Timeline

  • 2026-06-18: patched: Version 0.9.0 released to address the RCE.
  • 2026-07-06: disclosed: CVE-2026-57572 published.

References

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