H2O has an External Control of File Name or Path vulnerability
A vulnerability in h2oai/h2o-3 version 3.46.0.1 allows remote attackers to write arbitrary data to any file on the server. This is achieved by exploiting the /3/Parse endpoint to inject attacker-controlled data as the header of an empty file, which is then exported using the /3/Frames/framename/export endpoint. The impact of this vulnerability includes the potential for remote code execution and complete access to the system running h2o-3, as attackers can overwrite critical files such as private SSH keys or script files.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ai.h2o:h2o-core | <= 3.46.0.1 | no fix |
| Python (PyPI) | h2o | <= 3.46.0.1 | no fix |
References
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H- Weakness (CWE)
CWE-73- Platform
- Java / Kotlin (Maven), Python (PyPI)
- Package
ai.h2o:h2o-core, h2o- Disclosed
- 02.02.2026
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wj3h-wx8g-x699 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-353 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: h2o
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 12.2023 04.2026
- Without a fix
- 14
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 9
- Medium 2
Disclosures per year
- 2023: 1
- 2024: 3
- 2025: 11
- 2026: 2
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H2O has an External Control of File Name or Path vulnerability this entry
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