CVE-2025-6544

Deserialization Vulnerability in h2oai/h2o-3

Published Sep 21, 2025 CVSS 3.0 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-30380 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.
Github GHSA Github GHSA GHSA-5w3j-gwgh-4rfv H2O affected by a deserialization vulnerability
History
Type Values Removed Values Added
First Time appeared H2o
H2o h2o
CPEs cpe:2.3:a:h2o:h2o:*:*:*:*:*:*:*:*
Vendors & Products H2o
H2o h2o
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared H2oai
H2oai h2o-3
Vendors & Products H2oai
H2oai h2o-3
Type Values Removed Values Added
Description 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.
Title Deserialization Vulnerability in h2oai/h2o-3
Weaknesses CWE-502
References
Metrics cvssV3_0

{'score': 9.8, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
@huntr_ai
Published
Updated
Sep 22, 2025, 5:23 PM
Reserved
Jun 23, 2025, 6:25 PM
Status
Analyzed
Published
Sep 21, 2025, 9:15 AM
Modified
Oct 5, 2026, 2:10 PM