Deserialization Vulnerability in h2oai/h2o-3

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-6544
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-21 09:15:38 UTC
Updated2026-10-01 16:10:00 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 9.8 CRITICAL from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-502 CWE-502 Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary9.8CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.0CNADECLARED9.8CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application H2o H2o All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA H2oai H2oai/h2o-3 affected unspecified 3.46.8 custom Not specified

References

ReferenceSourceLinkTags
huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com Exploit, Third Party Advisory
github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25 [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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