CVE-2024-10550: H2o Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-7qq7-pvm9-x8rf
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CVSS 7.5
CWE-1333
Published
Advisory Summary

CVE-2024-10550 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting H2o libraries in the PyPI ecosystem. The issue involves h2o vulnerable to denial of service (dos) via `/3/parsesetup` endpoint. Remediation is available in the latest vendor maintenance releases.

CVE-2024-10550 at a Glance

CVE Identifier CVE-2024-10550
GHSA Identifier GHSA-7qq7-pvm9-x8rf
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product H2o
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2024-10550

To remediate this vulnerability, upgrade all affected H2o dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

h2o fixed: Latest secure release 
pip install h2o>=Latest secure release
ai.h2o:h2o-core fixed: Latest secure release 
<dependency>
    <groupId>ai.h2o</groupId>
    <artifactId>h2o-core</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show h2o

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2024-10550, inspect your installed packages using pip:

pip show h2o

Analyze the terminal output to locate any version of H2o in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show h2o command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In H2o, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.

CVE-2024-10550 Affected H2o Versions

2 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
h2o
pypi/h2o
PyPI
≥ 3.30.0.7
≤ 3.46.0.1
ai.h2o:h2o-core
maven/ai.h2o/h2o-core
Maven
≥ 3.30.0.7
≤ 3.46.0.1

References

NVD — CVE-2024-10550 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-10550
H2o Source Repository REPOSITORY
https://github.com/h2oai/h2o-3
H2o Source Repository REPOSITORY
https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseSetupHandler.java#L121
huntr.com/bounties/ef3f4d89-3... WEB
https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6

Frequently Asked Questions

What is CVE-2024-10550?
CVE-2024-10550 is a security vulnerability in H2o involving H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint under CWE-1333: Inefficient Regular Expression Complexity.
Which H2o versions are affected?
Affected versions include releases prior to current release patches across affected packages: h2o, ai.h2o:h2o-core.
What version fixes CVE-2024-10550?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is h2o affected?
Yes, h2o is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
Is h2o-core affected?
Yes, ai.h2o:h2o-core is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2024-10550?
CVE-2024-10550 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-10550?
CVE-2024-10550 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check PyPI dependencies for CVE-2024-10550?
Run the dependency tree command: 'pip show h2o'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7qq7-pvm9-x8rf",
  "modified" : "2025-03-20T19:31:56Z",
  "published" : "2025-03-20T12:32:39Z",
  "aliases" : [ "CVE-2024-10550" ],
  "summary" : "H2O Vulnerable to Denial of Service (DoS) via `/3/ParseSetup` Endpoint",
  "details" : "A vulnerability in the `/3/ParseSetup` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint applies a user-specified regular expression to a user-controllable string. This can be exploited by an attacker to cause inefficient regular expression complexity, leading to the exhaustion of server resources and making the server unresponsive.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
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      "name" : "h2o"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.30.0.7"
      }, {
        "last_affected" : "3.46.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "ai.h2o:h2o-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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      }, {
        "last_affected" : "3.46.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-10550"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/h2oai/h2o-3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/h2oai/h2o-3/blob/51c25940ded8b7d0acc8f3f72329fd9dedbb3a34/h2o-core/src/main/java/water/api/ParseSetupHandler.java#L121"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.com/bounties/ef3f4d89-3b8b-4618-b134-cb93c1664ec6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-20T19:31:56Z",
    "nvd_published_at" : "2025-03-20T10:15:17Z"
  }
}