GHSA-7qq7-pvm9-x8rf: h2o (CVE-2024-10550)

H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` 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.

Package	Ecosystem	Affected	Fixed in
h2o	PyPI	>=3.30.0.7, <=3.46.0.1	No fixed version yet
ai.h2o:h2o-core	Maven	>=3.30.0.7, <=3.46.0.1	No fixed version yet

Identifiers

GHSA-7qq7-pvm9-x8rf · CVE-2024-10550 · PYSEC-2026-1440

Weakness (CWE)

CWE-1333

Machine-written summary

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

The h2o and ai.h2o:h2o-core packages, versions 3.30.0.7 through 3.46.0.1, are affected. An attacker who can control input to the /3/ParseSetup endpoint can trigger inefficient regular expression processing, exhausting server resources and making the server 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

Score	Rating	CVSS	Vector	Source
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 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:20 UTC First seen by agentprime
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.