CVE-2024-6960: H2O deserializes ML models without filtering, potentially allowing execution of malicious code

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-21 · updated 2026-06-17
Weakness: CWE-502

Description

The H2O machine learning platform uses "Iced" classes as the primary means of moving Java Objects around the cluster. The Iced format supports inclusion of serialized Java objects. When a model is deserialized, any class is allowed to be deserialized (no class whitelist). An attacker can construct a crafted Iced model that uses Java gadgets and leads to arbitrary code execution when imported to the H2O platform.

Affected products

Mvnrepository H2O-Core: all versions

References

https://research.jfrog.com/vulnerabilities/h2o-model-deserialization-rce-jfsa-2024-001035518/
https://research.jfrog.com/vulnerabilities/h2o-model-deserialization-rce-jfsa-2024-001035518/
https://mvnrepository.com/artifact/ai.h2o/h2o-core

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