What is CVE-2025-5662?

CVE-2025-5662 is a critical-severity vulnerability in H2oai H2oai/h2o-3, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-09-02.

How severe is CVE-2025-5662?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-5662 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in H2oai H2oai/h2o-3

CVE-2025-5662

A deserialization vulnerability exists in the H2O-3 REST API (POST /99/ImportSQLTable) that affects all versions up to 3.46.0.7. This vulnerability allows remote code execution (RCE) due to improper validation of JDBC connection parameters when using a Key-Value format. The vulnerability is present in the MySQL JDBC Driver version 8.0.19 and JDK version 8u112. The issue is resolved in version 3.46.0.8.

Vulnerability class: Insecure Deserialization

EPSS: 0.006 (47.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

H2oai H2oai/h2o-3 — versions unspecified

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-5662?: CVE-2025-5662 is a critical-severity vulnerability in H2oai H2oai/h2o-3, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-09-02.
How severe is CVE-2025-5662?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-5662 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.