---
id: CVE-2024-5979
aliases:
  - GHSA-58m3-rcvp-f9ww
  - PYSEC-2026-1437
title: h2o vulnerable to unexpected POST request shutting down server
summary: h2o vulnerable to unexpected POST request shutting down server
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: h2o
product: h2o
ecosystem: pip
affected:
  - h2o <= 3.46.0
published: '2024-06-27'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-58m3-rcvp-f9ww'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-5979'
  - url: >-
      https://github.com/h2oai/h2o-3/commit/d0899f8e0f7a584b60405a65b1d7b439aaaa55a5
  - url: 'https://github.com/h2oai/h2o-3'
  - url: 'https://huntr.com/bounties/d80a2139-fc03-44b7-b739-de41e323b458'
tags:
  - osv
  - pip
epss: 0.00794
epssPercentile: 0.54911
ingestedAt: '2026-07-08T18:25:45.818Z'
---

## Overview

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

- `h2o <= 3.46.0`

## Remediation

Refer to the advisory for the patched release.