CVE Catalog

CVE-2025-6544

CriticalCVSS 9.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
0.92%

59th percentile - higher than 59% of all known CVEs

Summary

A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8 due to improper handling of JDBC connection parameters. Attackers can bypass regular expression checks using double URL encoding, allowing them to read arbitrary system files and execute arbitrary code.

Risk Assessment

This vulnerability affects all users of the affected versions and enables full server compromise and data exfiltration. It is especially dangerous in environments where h2o-3 is exposed to users or integrates with external data sources.

Recommendation

Upgrade h2o-3 to a version newer than 3.46.0.8. Additionally, restrict user-supplied JDBC connection parameters and enforce server-side input validation.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS