---
id: CVE-2024-8062
aliases:
  - GHSA-5c8j-g96x-cj78
  - PYSEC-2026-1438
title: H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request
summary: H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request
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 >= 3.2.0.1, <= 3.46.0'
  - 'ai.h2o:h2o-core >= 3.2.0.1, <= 3.46.0'
published: '2025-03-20'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-5c8j-g96x-cj78'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-8062'
  - url: 'https://github.com/h2oai/h2o-3'
  - url: >-
      https://github.com/h2oai/h2o-3/blob/047a4d617240a56e74f834207c65973d133391cb/h2o-core/src/main/java/water/persist/PersistManager.java#L302
  - url: 'https://huntr.com/bounties/a04190d9-4acb-449a-9a7f-f1bf6be1ed23'
tags:
  - osv
  - pip
epss: 0.00473
epssPercentile: 0.40091
ingestedAt: '2026-07-08T18:25:45.957Z'
---

## Overview

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 packages

- `h2o >= 3.2.0.1, <= 3.46.0`
- `ai.h2o:h2o-core >= 3.2.0.1, <= 3.46.0`

## Remediation

Refer to the advisory for the patched release.