Vulnerability in Crawl4ai
CVE-2026-56265
Crawl4AI before 0.8.7 contains an authentication bypass vulnerability due to a hardcoded default JWT signing key in the Docker API server. Attackers who know the default key can forge valid authentication tokens for any user, bypassing authentication and gaining full access to protected functionality.
EPSS: 0.026 (84.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Crawl4ai — versions 0, 0.8.7
- Kidocode Crawl4ai
Weakness classification (CWE)
References
- https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg (vendor-advisory, Mitigation, Vendor Advisory)
- https://github.com/unclecode/crawl4ai (Product, product)
- VulnCheck Advisory: Crawl4AI - Authentication Bypass via Hardcoded JWT Signing Key (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56265?
- CVE-2026-56265 is a critical-severity vulnerability in Crawl4ai, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2026-06-21.
- How severe is CVE-2026-56265?
- Critical severity. CVSS v3 base score is 9.8 out of 10.