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HIGH severity

CVE-2024-5979 — h2o

HIGHFix: h2oai/h2o-3@d0899f8

CVE-2024-5979 is a high-severity (CVSS 7.5) Code Injection vulnerability in h2o. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Denial of Service via Invalid Argument in h2oai/h2o-3

Also known asGHSA-58m3-rcvp-f9wwPYSEC-2026-1437
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-5979.

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.43%0.86%1.29%0.1%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍h2o

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

In h2oai/h2o-3 version 3.46.0, the run_tool command in the rapids component allows the main function of any class under the water.tools namespace to be called. One such class, MojoConvertTool, crashes the server when invoked with an invalid argument, causing a denial of service.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIh2oall versionsNo fix

Affected Products

1 product · 1 configurations
Application
h2oh2o
1 version
3.46.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for h2o, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of h2o for CVE-2024-5979. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

In h2oai/h2o-3 version 3.46.0, the `run_tool` command in the `rapids` component allows the `main` function of any class under the `water.tools` namespace to be called. One such class, `MojoConvertTool`, crashes the server when invoked with an invalid argument, causing a denial of service.
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CVE-2024-5979: h2o: Denial of Service via Invalid Argument