CVE-2026-53754: high-severity vulnerability in unclecode crawl4ai
Crawl4AI: SSRF filter bypass in Docker server via IPv6 transition forms (NAT64 / 6to4 / unspecified / v4-mapped)
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.8, the Docker API server's SSRF protection (validate_webhook_url / validate_url_destination in deploy/docker/utils.py) used an explicit IPv4/IPv6 CIDR blocklist that missed several address families. An attacker could reach internal services and cloud metadata endpoints (e.g. 169.254.169.254) despite the filter by encoding an internal IPv4 address inside an IPv6 transition form, or by using the IPv6 unspecified address. Because the Docker API is unauthenticated by default (jwt_enabled: false), no credentials are required. This vulnerability is fixed in 0.8.8.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
unclecode · crawl4aiRelated CVEs — unclecode crawl4ai
In the same product, most dangerous first.
CVE-2026-53753CRITICALCrawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker APIEPSS 2.9%CVE-2026-53755HIGHCrawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF checkEPSS 1.6%CVE-2026-57572CRITICALCrawl4AI: Unauthenticated RCE via Chromium launch-argument injection in browser_config.extra_argsEPSS 0.9%CVE-2026-57571CRITICALCrawl4AI arbitrary file write via download filename path traversalEPSS 0.8%CVE-2026-91941HIGHCrawl4AI before 0.9.3 Denial of Service via PDFContentScrapingStrategyEPSS 0.5%CVE-2026-91940HIGHcrawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategyEPSS 0.5%