CVE-2026-53755: high-severity vulnerability in unclecode crawl4ai
Crawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF check
Published · Updated
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36Vexday Risk Score
Patch soon. It has a working public exploit.
ssvc Attendcvss 8.6epss 1.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products
unclecode · crawl4aiRelated CVEs — unclecode crawl4ai
In the same product, most dangerous first.
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