SSRF in Unclecode Crawl4ai
CVE-2026-109239
Crawl4AI before 0.9.4 contains a blind server-side request forgery vulnerability in RobotsParser.can_fetch that lets unauthenticated attackers bypass Docker server egress controls. Attackers can enable check_robots_txt and use redirects or DNS rebinding to reach internal, loopback, or cloud-metadata addresses for service discovery.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/unclecode/crawl4ai/security/advisories/GHSA-f77g-77vp-r96v (vendor-advisory)
- www.vulncheck.com/advisories/crawl4ai-before-0.9.4-blind-ssrf-via-robotsparser-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109239?
- CVE-2026-109239 is a medium-severity vulnerability in Unclecode Crawl4ai, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-10-12.
- How severe is CVE-2026-109239?
- Medium severity. CVSS v3 base score is 5.3 out of 10.