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Advisory record · GHSA-wwr9-4gmr-xvq9

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

CVSS 7.5 HighEPSS 0.0064 · 51st 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>=3.30.0.7, <=3.46.0.1No fixed version yet
ai.h2o:h2o-coreMaven>=3.30.0.7, <=3.46.0.1No fixed version yet
Identifiers
GHSA-wwr9-4gmr-xvq9 · CVE-2024-10549 · PYSEC-2026-1445
Weakness (CWE)
CWE-400 · CWE-1333
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 (versions 3.30.0.7 through 3.46.0.1) and ai.h2o:h2o-core (same versions) are vulnerable to denial of service through the /3/Parse endpoint. An attacker who sends many simultaneous requests with user-specified regular expression input can exhaust server threads and cause a complete denial of service. 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 0.0064, the 51st percentile, on 14 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.