Unauthenticated code execution via PostgreSQL JDBC parameters
Published Apr 23, 2026 · Updated Apr 23, 2026
Code injection in H2O-3 before 3.46.0.10 allows remote attackers to execute code through the unauthenticated /99/ImportSQLTable endpoint. SQLManager.validateJdbcUrl blocks dangerous MySQL parameters but accepts PostgreSQL socketFactory and socketFactoryArg values that instantiate an attacker-selected class with a supplied argument. The endpoint is open in default unsecured deployments, and successful exploitation runs code with the H2O-3 process privileges.
Summary
What happened
Code injection in H2O-3 before 3.46.0.10 allows remote attackers to execute code through the unauthenticated /99/ImportSQLTable endpoint. SQLManager.validateJdbcUrl blocks dangerous MySQL parameters but accepts PostgreSQL socketFactory and socketFactoryArg values that instantiate an attacker-selected class with a supplied argument. The endpoint is open in default unsecured deployments, and successful exploitation runs code with the H2O-3 process privileges.
The record
- CVE
- CVE-2026-3960
- Published
- Apr 23, 2026
- Updated
- Apr 23, 2026
- Vendor
- H2O.ai
- Product
- H2O-3
- Classifications
- CWE-94, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 23, 2026CVE publishedPublication date reported by the CVE source.
- Apr 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <3.46.0.10
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- huntr H2O-3 PostgreSQL JDBC proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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