CVE-2026-109237 Crawl4AI 0.9.0 before 0.9.4 Untrusted Config Gate Bypass Leaks Environment Variables
Attackers can bypass config restrictions to leak environment variables and forge admin JWTs, compromising the Crawl4AI web crawler library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109237?
CVE-2026-109237 is a high-severity unsafe deserialization vulnerability in unclecode crawl4ai, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-109237?
How do I fix CVE-2026-109237?
No fix has been published for CVE-2026-109237 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-109237 being exploited?
There is no known exploitation of CVE-2026-109237 in the wild and no public exploit code.
Sources
Also known as GHSA-5w5p-vcv6-mm3f, GHSA-r6v9-2q53-jfjp.