H2O-3GHSA-6w62-3jvj-mfj6
H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing
High7.5CVE-2024-7765 · Published Mar 20, 2025 · updated Jul 7, 2026
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| h2o PyPI | >= 3.32.1.2, <= 3.46.0.2 | 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-409
- Also known as
- CVE-2024-7765, PYSEC-2026-1439
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 `HEAD` RequestHigh7.5Mar 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 |