critical · 9.8 Patched

H2O Deserialization of Untrusted Data Vulnerability

CVE-2024-10553 · GHSA-h7xg-cmpp-48hf · PYSEC-2026-351 · published 20 Mar 2025

How serious is it

  • Severity: critical, CVSS score 9.8 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2024-10553?

Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.

Who is affected

  • h2o (PyPI) < 3.46.0.6
  • ai.h2o:h2o-core (Maven) < 3.46.0.6

How to check

  1. Run pip show h2o in your project to see the installed version, including copies pulled in by other packages.
  2. Look for ai.h2o:h2o-core in your lockfile and compare its version with the range above.
  3. Or paste your lockfile into the checker: it lists every package with a known vulnerability, this one included.
  4. Or run npx shippable-dev scan localhost:3000 in your project folder. It reads your lockfile and flags this vulnerability along with every other known one.

How to fix

Copies a prompt for Claude Code, Cursor or Codex: it checks your lockfiles for this and upgrades it.
  1. On < 3.46.0.6: Upgrade h2o to 3.46.0.6 or later, commit the lockfile and redeploy.
  2. On < 3.46.0.6: Upgrade ai.h2o:h2o-core to 3.46.0.6 or later, commit the lockfile and redeploy.
  3. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

A vulnerability in the h2oai/h2o-3 REST API versions 3.46.0.4 allows unauthenticated remote attackers to execute arbitrary code via deserialization of untrusted data. The vulnerability exists in the endpoints POST /99/ImportSQLTable and POST /3/SaveToHiveTable, where user-controlled JDBC URLs are passed to DriverManager.getConnection, leading to deserialization if a MySQL or PostgreSQL driver is available in the classpath. This issue is fixed in version 3.46.0.6.

Check your whole app

Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.

References

Merged from GitHub Advisory Database, OSV. Last updated 28 Oct 2026. All vulnerabilities · RSS · JSON

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