GHSA-wwr9-4gmr-xvq9HighCVSS 7.5

H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint

Published
March 20, 2025
Last Modified
October 15, 2025

🔗 CVE IDs covered (1)

CVE-2024-10549 →

📋 Description

A vulnerability in the /3/Parse endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.

🎯 Affected products2

  • pip/h2o:>= 3.30.0.7, <= 3.46.0.1
  • maven/ai.h2o:h2o-core:>= 3.30.0.7, <= 3.46.0.1

🔗 References (4)