CVE-2026-53755
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
crawl4aiPyPI | < 0.8.9 | 0.8.9 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-6qhc-x826-342cghsaADVISORY
- github.com/unclecode/crawl4ai/security/advisories/GHSA-6qhc-x826-342cnvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-53755ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/crawl4ai/PYSEC-2026-588.yamlghsaWEB
News mentions
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