---
id: CVE-2024-5550
aliases:
  - GHSA-x234-r5fg-x52m
  - PYSEC-2026-1446
title: Arbitrary system path lookup in h20
summary: Arbitrary system path lookup in h20
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
vendor: h2o
product: h2o
ecosystem: pip
affected:
  - h2o <= 3.40.0.4
published: '2024-06-06'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-x234-r5fg-x52m'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-5550'
  - url: 'https://github.com/h2oai/h2o-3'
  - url: 'https://huntr.com/bounties/e76372c2-39be-4984-a7c8-7048a75a25dc'
tags:
  - osv
  - pip
epss: 0.00835
epssPercentile: 0.56197
ingestedAt: '2026-07-08T18:25:54.050Z'
---

## Overview

In h2oai/h2o-3 version 3.40.0.4, an exposure of sensitive information vulnerability exists due to an arbitrary system path lookup feature. This vulnerability allows any remote user to view full paths in the entire file system where h2o-3 is hosted. Specifically, the issue resides in the Typeahead API call, which when requested with a typeahead lookup of '/', exposes the root filesystem including directories such as /home, /usr, /bin, among others. This vulnerability could allow attackers to explore the entire filesystem, and when combined with a Local File Inclusion (LFI) vulnerability, could make exploitation of the server trivial.

## Affected packages

- `h2o <= 3.40.0.4`

## Remediation

Refer to the advisory for the patched release.