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Advisory record · GHSA-6w62-3jvj-mfj6

H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing

CVSS 7.5 HighEPSS 0.0078 · 56th 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>=3.32.1.2, <=3.46.0.2No fixed version yet
ai.h2o:h2o-coreMaven>=3.32.1.2, <=3.46.0.2No fixed version yet
Identifiers
GHSA-6w62-3jvj-mfj6 · CVE-2024-7765 · PYSEC-2026-1439
Weakness (CWE)
CWE-409
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.

The h2o package (PyPI) and ai.h2o:h2o-core (Maven), versions 3.32.1.2 through 3.46.0.2, are affected. An attacker who can upload large GZIP files for repeated parsing can exhaust memory and flood the server with slow jobs, making it unresponsive. 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 0.0078, the 56th percentile, on 6 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.