H2O Vulnerable to Execution of Arbitrary Files
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ai.h2o:h2o-core | >= 3.32.1.2, <= 3.46.0 | no fix |
| Python (PyPI) | h2o | >= 3.32.1.2, <= 3.46.0 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-6863
- https://github.com/h2oai/h2o-3
- https://github.com/h2oai/h2o-3/blob/a20b5b19b769866ee24b217ee78b820e64c1cd6a/h2o-core/src/main/java/water/tools/EncryptionTool.java#L49
- https://huntr.com/bounties/10f55937-0cba-4530-897f-2abf30ed5270
- https://pypi.org/project/h2o
- https://github.com/advisories/GHSA-m37h-8r48-2cxj
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L- Weakness (CWE)
CWE-749- Platform
- Java / Kotlin (Maven), Python (PyPI)
- Package
ai.h2o:h2o-core, h2o- Disclosed
- 20.03.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-m37h-8r48-2cxj - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-1442 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: ai.h2o:h2o-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 15
- First → latest
- 11.2023 04.2026
- Without a fix
- 13
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 8
- Medium 1
Disclosures per year
- 2023: 1
- 2024: 2
- 2025: 10
- 2026: 2
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H2O Vulnerable to Execution of Arbitrary Files this entry
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