cvedb.io
CVE-2025-6544
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2025-09-21T09:15:38.497 · Last modified 2026-06-17T10:02:07.133

Summary

A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, 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.

Affected products

h2o — h2o

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.