PT-2026-53440 · Pypi · H2O

Published 2026-06-29 · Updated 2026-06-29

OSV

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Related Identifiers

PYSEC-2026-351

Affected Products

H2O

References · 7

• https://osv.dev/vulnerability/PYSEC-2026-351 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-10553 · Security Note
• https://github.com/h2oai/h2o-3/commit/ac1d642b4d86f10a02d75974055baf2a4b2025ac · Note
• https://github.com/h2oai/h2o-3 · Note
• https://pypi.org/project/h2o · Note
• https://huntr.com/bounties/e6f550dd-eda2-428c-a740-ed8f893a084b · Note
• https://github.com/advisories/GHSA-h7xg-cmpp-48hf · Note