unclecode crawl4ai up to 0.8.8 Docker API /crawl/stream server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in unclecode crawl4ai up to 0.8.8. Affected by this issue is some unknown functionality of the file /crawl/stream of the component Docker API. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-53755. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in unclecode crawl4ai up to 0.8.8. This issue affects an unknown functionality of the file /crawl/stream of the component Docker API. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. The summary by CVE is:

Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.9, the Docker API server applied its SSRF destination check to the crawl target URL only, not to the proxy address. An unauthenticated request could supply a proxy pointing at an internal IP and route the browser through it, reaching internal services and cloud-metadata endpoints, while using a perfectly valid crawl URL. The Docker API is unauthenticated by default. /crawl, /crawl/stream, and /crawl/job accept a browser_config (and crawler_config). The following all feed Chromium's egress and were unchecked: browser_config.proxy_config.server, browser_config.proxy (deprecated field), crawler_config.proxy_config.server, and --proxy-server / --proxy-pac-url / --proxy-bypass-list / --host-resolver-rules flags in browser_config.extra_args. This vulnerability is fixed in 0.8.9.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-53755 since 06/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 0.8.9 eliminates this vulnerability.

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Productinfo

Vendor

• unclecode

Name

• crawl4ai

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5
• 0.8.6
• 0.8.7
• 0.8.8

Website

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

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