H2O-3GHSA-5c8j-g96x-cj78
H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request
High7.5CVE-2024-8062 · Published Mar 20, 2025 · updated Jul 7, 2026
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| h2o PyPI | >= 3.2.0.1, <= 3.46.0 | No fix yet |
Details and references
- CVSS 3.0
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-1088
- Also known as
- CVE-2024-8062, PYSEC-2026-1438
More H2O-3 advisories
All H2O-3| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Mar 202025 | H2O Vulnerable to Arbitrary File Overwrite High8.2Mar 20, 2025 | High8.2 | No fix yet |
| Mar 202025 | H2O Vulnerable to Denial of Service (DoS) via Large GZIP ParsingHigh7.5Mar 20, 2025 | High7.5 | No fix yet |
| Mar 202025 | H2O Vulnerable to Denial of Service (DoS) via `/3/ImportFiles` EndpointHigh7.5Mar 20, 2025 | High7.5 | No fix yet |
| Mar 202025 | H2O Vulnerable to Arbitrary File Overwrite via File ExportHigh7.1Mar 20, 2025 | High7.1 | No fix yet |
| Mar 202025 | H2O Vulnerable to Execution of Arbitrary FilesMedium6.5Mar 20, 2025 | Medium6.5 | No fix yet |
| Mar 202025 | H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` EndpointHigh7.5Mar 20, 2025 | High7.5 | No fix yet |