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Advisory record · GHSA-h7xg-cmpp-48hf

H2O Deserialization of Untrusted Data Vulnerability

CVSS 9.8 CriticalCriticalEPSS 0.016 · 76th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 20 Mar 2025, 12:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
h2oPyPI<3.46.0.63.46.0.6
ai.h2o:h2o-coreMaven<3.46.0.63.46.0.6
Identifiers
GHSA-h7xg-cmpp-48hf · CVE-2024-10553 · PYSEC-2026-351
Weakness (CWE)
CWE-502
Tags
Published
20 Mar 2025
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The H2O machine learning platform is vulnerable to deserialization of untrusted data, affecting the Maven package ai.h2o:h2o-core and the PyPI package h2o before 3.46.0.6. The source says an unauthenticated remote attacker can execute arbitrary code by sending crafted input to certain REST API endpoints, where user-supplied JDBC URLs lead to deserialization when a MySQL or PostgreSQL driver is on the classpath. Upgrade to version 3.46.0.6, which contains the fix.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (@huntr_ai)
  • CISA KEV Not listed.
  • EPSS 0.016, the 76th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.