CVE-2024-10550Public exploitNetwork attack vector

Service interruption via unescaped partition regex

Published Mar 20, 2025 · Updated Mar 20, 2025

Regular expression denial of service in H2O.ai H2O-3 3.46.0.1 allows remote attackers to make the server unresponsive via ParseSetup requests. ParseSetupHandler concatenates each untrusted partition_by value into a Java Pattern and matches it against an attacker-named frame path without escaping or complexity limits. No authentication or user interaction is required; concurrent requests can exhaust request-processing threads and interrupt every API and the web interface.

CVSS severity7.5
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in H2O.ai H2O-3 3.46.0.1 allows remote attackers to make the server unresponsive via ParseSetup requests. ParseSetupHandler concatenates each untrusted partition_by value into a Java Pattern and matches it against an attacker-named frame path without escaping or complexity limits. No authentication or user interaction is required; concurrent requests can exhaust request-processing threads and interrupt every API and the web interface.

The record

CVE
CVE-2024-10550
Published
Mar 20, 2025
Updated
Mar 20, 2025
Vendor
H2O.ai
Product
H2O-3
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

H2O.ai · H2O-3version=unspecified <=latest

Published CVSS scores

7.5huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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