Crawl4AI 0.8.7 through 0.9.5 SSRF Bypass via SSLCertificate.from_url URL Userinfo

Summary

Crawl4AI from 0.8.7 through 0.9.5 contains a server-side request forgery vulnerability in the Docker API server that allows unauthenticated attackers to bypass destination checks via URL userinfo parsing differences. Attackers can set fetch_ssl_certificate=true with crafted userinfo URLs so SSLCertificate.from_url connects to internal hosts on port 443, probing reachability and leaking certificate details.

Evidence

Reported to the maintainer with a proof of concept that reproduced against the affected release.

Remediation

No fixed release is listed in the advisory. Check the references for upstream status.

References

• VulnCheck advisoryhttps://www.vulncheck.com/advisories/crawl4ai-0.8.7-through-0.9.5-ssrf-bypass-via-sslcertificate-from-url-url-userinfo
• Fix pull requesthttps://github.com/unclecode/crawl4ai/pull/2304
• Vulnerable codehttps://github.com/unclecode/crawl4ai/blob/v0.9.5/crawl4ai/ssl_certificate.py
• Vulnerable codehttps://github.com/unclecode/crawl4ai/blob/v0.9.5/crawl4ai/async_crawler_strategy.py
• Vulnerable codehttps://github.com/unclecode/crawl4ai/blob/v0.9.5/deploy/docker/utils.py
• CVE recordhttps://www.cve.org/CVERecord?id=CVE-2026-112363