CVE-2026-8751
CWE-20Published: May 17, 2026· Updated: May 19, 2026
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.
Risk Analysis
This critical vulnerability in h2oai h2o-3 allows for remote deserialization, which can lead to severe system compromise. The CVSS score of 9.8 highlights the extreme danger, making this an urgent vulnerability to address.
No public exploit is currently known for this vulnerability, despite the description stating an exploit has been released. It is remotely exploitable due to its network attack vector and low attack complexity.
Users of h2oai h2o-3 up to version 7402 should upgrade to a patched version. Ensure proper input validation and disable deserialization of untrusted data where possible.
Technical Analysis
CVE-2026-8751 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (4)
Quick Facts
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-8751 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts