CVE-2024-7765 Denial of Service in h2oai/h2o-3
Attackers can cause denial of service in H2O-3 by uploading large GZIP files, leading to memory exhaustion and server unresponsiveness.
- 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-2024-7765?
CVE-2024-7765 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
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.
Weakness: CWE-409
Which versions are affected by CVE-2024-7765?
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 3.32.1.2 to 3.46.0.2 | None |
h2o PyPI | From 3.32.1.2 to 3.46.0.2 | None |
h2o PyPI | From 3.32.1.2 to 3.46.0.2 | None |
ai.h2o:h2o-core Maven | From 3.32.1.2 to 3.46.0.2 | None |
ai.h2o:h2o-core Maven | From 3.32.1.2 to 3.46.0.2 | None |
Products include H2o H2o.
How do I fix CVE-2024-7765?
No fix has been published for CVE-2024-7765 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-2024-7765 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7765 exists.
Other vulnerabilities in h2oai/h2o-3
Sources
Also known as GHSA-6w62-3jvj-mfj6, PYSEC-2026-1439.