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Open-source package vulnerability · Maven

CVE-2025-6544: H2O affected by a deserialization vulnerability

criticalCVSS 3.0 9.8GHSA-5w3j-gwgh-4rfv

A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.7, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.

Published Sep 22, 2025

Affected packages

ai.h2o:h2o-core

Ecosystem
Maven
Affected
<= 3.46.0.7
Fixed in
No patched version yet
Check
mvn dependency:tree -Dincludes=ai.h2o:h2o-core

h2o

Ecosystem
PyPI
Affected
<= 3.46.0.7
Fixed in
No patched version yet
Check
pip show h2o

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.7, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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