Insecure Deserialization Vulnerability in H2O.ai H2O-3 Product
CVE-2026-8751

6.9MEDIUM

Key Information:

Vendor

H2oai

Status
H2o-3
Vendor
CVE Published:
17 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8751?

A security flaw has been identified in H2O.ai's H2O-3, specifically within the importBinaryModel function in the JAR Handler component. This vulnerability allows for insecure deserialization, which can be exploited remotely, potentially enabling an attacker to manipulate system behavior or gain unauthorized access. The vendor was informed of the issue but has not provided any response.

Affected Version(s)

h2o-3 7402

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-8751 - Proof of Concept

References

https://vuldb.com/vuln/364378
vdb-entrytechnical-description
https://vuldb.com/vuln/364378/cti
signaturepermissions-required
https://vuldb.com/submit/810107
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

vulnplusbot (VulDB User)
VulDB CNA Team
.