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Advisory record · GHSA-5c8j-g96x-cj78

H2O Vulnerable to Denial of Service (DoS) via `HEAD` Request

CVSS 7.5 HighEPSS 0.0048 · 41st percentile

Published by the GitHub Advisory Database at 20 Mar 2025, 12:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
h2oPyPI>=3.2.0.1, <=3.46.0No fixed version yet
ai.h2o:h2o-coreMaven>=3.2.0.1, <=3.46.0No fixed version yet
Identifiers
GHSA-5c8j-g96x-cj78 · CVE-2024-8062 · PYSEC-2026-1438
Weakness (CWE)
CWE-1088
Tags
Published
20 Mar 2025
Updated
7 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

h2o (PyPI) and ai.h2o:h2o-core (Maven), versions 3.2.0.1 through 3.46.0, are affected. The typeahead endpoint makes HEAD requests without a timeout, so an attacker who sends repeated requests that reach a server they control can make the application hang and stop serving other requests. No fixed version is listed.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (@huntr_ai)
  • CISA KEV Not listed.
  • EPSS 0.0048, the 41st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.