CVE-2026-53755 – Crawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF check

CVE ID :CVE-2026-53755

Published : June 23, 2026, 6:15 p.m. | 1 hour, 28 minutes ago

Description :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.

Severity: 0.0 | NA

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