CVE-2024-8062 Denial of Service in h2oai/h2o-3
An attacker can cause a denial of service in H2O-3 by exploiting a missing timeout in the typeahead endpoint, blocking application responsiveness.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-8062?
CVE-2024-8062 is a high-severity denial of service vulnerability in h2oai/h2o-3, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a `HEAD` request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.
Weakness: CWE-1088
Which versions are affected by CVE-2024-8062?
5 open source packages ship an affected version, including h2o and ai.h2o:h2o-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
h2o PyPI | From 3.2.0.1 to 3.46.0 | None |
h2o PyPI | From 3.2.0.1 to 3.46.0 | None |
h2o PyPI | From 3.2.0.1 to 3.46.0 | None |
ai.h2o:h2o-core Maven | From 3.2.0.1 to 3.46.0 | None |
ai.h2o:h2o-core Maven | From 3.2.0.1 to 3.46.0 | None |
Products include H2o H2o.
How do I fix CVE-2024-8062?
No fix has been published for CVE-2024-8062 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-8062 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-8062 exists.
Other vulnerabilities in h2oai/h2o-3
Sources
Also known as GHSA-5c8j-g96x-cj78, PYSEC-2026-1438.