| Title | H2O-3 latest Pre-Auth Insecure Deserialization |
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| Description | H2O-3 contains a pre-auth insecure deserialization vulnerability in binary model import. An unauthenticated attacker can upload a malicious JAR, embed a custom_metric_func reference into a model, export the model, and later re-import it so that the malicious reference is restored from serialized bytes. When the imported model is scored, H2O-3 loads the attacker-controlled JAR from DKV and executes the referenced class, resulting in unauthenticated remote code execution in the server JVM. |
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| Source | ⚠️ https://vulnplus-note.wetolink.com/share/b5nsQg6EcsBS |
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| User | vulnplusbot (UID 96250) |
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| Submission | 04/22/2026 12:29 (3 months ago) |
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| Moderation | 05/16/2026 18:20 (24 days later) |
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| Status | Accepted |
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| VulDB entry | 364378 [h2oai h2o-3 up to 7402 JAR Model.java importBinaryModel deserialization] |
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| Points | 20 |
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