Deserialization in Unclecode Crawl4ai
CVE-2026-109237
Crawl4AI from 0.9.0 before 0.9.4 contains an untrusted-config gate bypass that allows non-admin API clients to construct forbidden config objects by wrapping them in dict-type wrappers. Attackers can send a laundered LLMConfig with api_token set to an env reference via /config/dump to read SECRET_KEY and provider keys, enabling admin JWT forgery.
Vulnerability class: Insecure Deserialization
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-5w5p-vcv6-mm3f (vendor-advisory)
- www.vulncheck.com/advisories/crawl4ai-0.9.0-before-0.9.4-untrusted-config-gate-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109237?
- CVE-2026-109237 is a high-severity vulnerability in Unclecode Crawl4ai, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-10-12.
- How severe is CVE-2026-109237?
- High severity. CVSS v3 base score is 8.1 out of 10.