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CVE-2026-3960

Remote Code Execution in h2oai/h2o-3

Published: Apr 23, 2026Updated: May 19, 2026 Sources: CVE List NVDCWE-94
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.8%
Top 49.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

h2oai/h2o-3h2oai
Mixed
AI / ML / ml-framework
h2oh2o
On-prem
Networking Infrastructure / load-balancer-proxy
h2oaicommercialAI / ML
h2ooss-projectNetworking Infrastructureaka h2o web server, h2o, picotls, quicly

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d
huntr.com
https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044
github.com

Timeline

Published
Apr 23, 2026
Last Updated
May 19, 2026

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