CVE-2026-8751 h2oai h2o-3 JAR Model.java importBinaryModel deserialization
Remote attackers can execute arbitrary code via unsafe deserialization in the h2o-3 library's model import function.
- 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-2026-8751?
CVE-2026-8751 is a medium-severity unsafe deserialization vulnerability in h2oai h2o-3, published on 17 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in h2oai h2o-3 up to 7402. This affects the function importBinaryModel of the file h2o-core/src/main/java/hex/Model.java of the component JAR Handler. Performing a manipulation results in deserialization. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-8751?
It affects 1 product.
Products include H2o H2o.
How do I fix CVE-2026-8751?
No fix has been published for CVE-2026-8751 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-2026-8751 being exploited?
There is no known exploitation of CVE-2026-8751 in the wild and no public exploit code.
Other vulnerabilities in h2oai h2o-3
Sources
Also known as GHSA-gvx7-3472-56wj.