h2o Known Vulnerabilities & Fixes
h2o has 6 known security vulnerabilities in PyPI (Python). Upgrade to version 3.46.0.10 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 3.46.0.10
Upgrading to 3.46.0.10 or later resolves all 6 known vulnerabilities in h2o. Run: pip install "h2o>=3.46.0.10"
Is h2o in your project?
Check if you're affected and upgrade to 3.46.0.10 to stay secure.
Security Summary
- 6 affected version ranges have been identified across these 6 advisories.
- 50% of known issues have a published fixed version.
- Remediation: pip install --upgrade h2o
Vulnerabilities
6 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed Sep 6, 2024, most recently Jun 29, 2026 (661 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2023-6569 External Control of File Name or Path in h2oai/h2o-3 | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+107 more) | 3.46.0.1 |
| CVE-2025-6544 H2O affected by a deserialization vulnerability | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+114 more) | No fix available |
| CVE-2024-10553 H2O Deserialization of Untrusted Data Vulnerability | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+112 more) | 3.46.0.6 |
| CVE-2026-3960 | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+116 more) | 3.46.0.10 |
| CVE-2024-45758 H2O.ai H2O vulnerable to deserialization attacks via a JDBC Connection URL | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+114 more) | No fix available |
| CVE-2024-5986 H2O has an External Control of File Name or Path vulnerability | CRITICAL | 3.10.0.10, 3.10.0.3, 3.10.0.6, 3.10.0.7 (+108 more) | No fix available |
About This Data
Vulnerability data for h2o is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related PyPI (Python) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
Check Your Dependencies
Scan your project to check if you're using a vulnerable version of h2o.