H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request
A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a HEAD request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ai.h2o:h2o-core | >= 3.2.0.1, <= 3.46.0 | no fix |
| Python (PyPI) | h2o | >= 3.2.0.1, <= 3.46.0 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-8062
- https://github.com/h2oai/h2o-3
- https://github.com/h2oai/h2o-3/blob/047a4d617240a56e74f834207c65973d133391cb/h2o-core/src/main/java/water/persist/PersistManager.java#L302
- https://huntr.com/bounties/a04190d9-4acb-449a-9a7f-f1bf6be1ed23
- https://pypi.org/project/h2o
- https://github.com/advisories/GHSA-5c8j-g96x-cj78
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1088- 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-5c8j-g96x-cj78 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-1438 - 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 Vulnerable to Denial of Service (DoS) via `HEAD` Request this entry
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