SSRF in Kidocode Crawl4ai
CVE-2026-53754
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.004 (37.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Kidocode Crawl4ai
- Unclecode Crawl4ai — versions < 0.8.8
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-53754?
- CVE-2026-53754 is a high-severity vulnerability in Kidocode Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-06-23.
- How severe is CVE-2026-53754?
- High severity. CVSS v3 base score is 7.5 out of 10.