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

June 16, 2026 (updated July 20, 2026)

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.

References

github.com/advisories/GHSA-6qhc-x826-342c
github.com/pypa/advisory-database/tree/main/vulns/crawl4ai/PYSEC-2026-588.yaml
github.com/unclecode/crawl4ai/security/advisories/GHSA-6qhc-x826-342c
nvd.nist.gov/vuln/detail/CVE-2026-53755

Code Behaviors & Features

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