unclecode Crawl4AI up to 0.8.x Streaming Request /crawl/stream handle_stream_crawl_request seed_url server-side request forgery

Summaryinfo

A vulnerability was found in unclecode Crawl4AI up to 0.8.x and classified as critical. This issue affects the function handle_stream_crawl_request of the file /crawl/stream of the component Streaming Request Handler. Executing a manipulation of the argument seed_url can lead to server-side request forgery. The identification of this vulnerability is CVE-2026-57573. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in unclecode Crawl4AI up to 0.8.x. This vulnerability affects the function handle_stream_crawl_request of the file /crawl/stream of the component Streaming Request Handler. The manipulation of the argument seed_url with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Crawl4AI is an open-source LLM-friendly web crawler and scraper. Prior to 0.9.0, the Docker API server applied its SSRF destination check on the non-streaming /crawl path but not on the streaming path. handle_stream_crawl_request passed seed URLs straight to the crawler with no destination validation, allowing a remote unauthenticated client to call POST /crawl/stream or POST /crawl with crawler_config.stream=true with a URL pointing at an internal, private, or link-local address; the server fetched it and streamed the response body back. This issue is fixed in version 0.9.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-57573 since 06/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 0.9.0 eliminates this vulnerability.

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Productinfo

Vendor

• unclecode

Name

• Crawl4AI

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8

Website

• Product: https://github.com/unclecode/crawl4ai/

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