CVE-2024-3884: Undertow core Undertow OutOfMemory When Parsing Form Vulnerability

HIGH
Advisory Identifier: GHSA-6h4f-pj3g-q8fq
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2024-3884 is a HIGH (CVSS 7.5) undertow outofmemory when parsing form vulnerability (CWE-20: Improper Input Validation) affecting Undertow core libraries in the Maven ecosystem. The issue involves undertow outofmemory when parsing form data encoding with application/x-www-form-urlencoded. Remediation is available by upgrading affected packages to version 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final.

CVE-2024-3884 at a Glance

CVE Identifier CVE-2024-3884
GHSA Identifier GHSA-6h4f-pj3g-q8fq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Undertow core
Package Ecosystem Maven
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:3.1/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-2024-3884

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

io.undertow:undertow-core fixed: 2.2.39.Final 
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.2.39.Final</version>
</dependency>
io.undertow:undertow-core fixed: 2.4.0.Beta1 
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.4.0.Beta1</version>
</dependency>
io.undertow:undertow-core fixed: 2.3.21.Final 
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.3.21.Final</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: 

mvn dependency:tree -Dincludes=io.undertow

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2024-3884, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.undertow

Analyze the terminal output to locate any version of Undertow core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.39.Final), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.undertow command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Undertow core, 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 flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.

CVE-2024-3884 Affected Undertow core Versions

3 component(s)
Fixed Versions:
2.2.39.Final2.4.0.Beta12.3.21.Final
Product / Package Ecosystem Affected Versions Fixed Version
io.undertow:undertow-core
maven/io.undertow/undertow-core
Maven
< 2.2.39.Final
2.2.39.Final
io.undertow:undertow-core
maven/io.undertow/undertow-core
Maven
≥ 2.4.0.Alpha1
< 2.4.0.Beta1
All 1 versions
2.4.0.Alpha1
2.4.0.Beta1
io.undertow:undertow-core
maven/io.undertow/undertow-core
Maven
≥ 2.3.0.Alpha1
< 2.3.21.Final
2.3.21.Final

References

NVD — CVE-2024-3884 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-3884
Undertow core Source Repository REPOSITORY
https://github.com/undertow-io/undertow/pull/1894
Undertow core Source Repository REPOSITORY
https://github.com/undertow-io/undertow/pull/1882
Undertow core Source Repository REPOSITORY
https://github.com/undertow-io/undertow/pull/1860
Undertow core Source Repository REPOSITORY
https://github.com/undertow-io/undertow/pull/1856
Security Fix Commit FIX COMMIT
https://github.com/undertow-io/undertow/commit/cb854c779b9e2368c3c274ebd7217c8e75d505be
Undertow core Release RELEASE
https://github.com/undertow-io/undertow/releases/tag/2.4.0.Beta1
Undertow core Release RELEASE
https://github.com/undertow-io/undertow/releases/tag/2.3.21.Final
Undertow core Release RELEASE
https://github.com/undertow-io/undertow/releases/tag/2.2.39.Final
Undertow core Source Repository REPOSITORY
https://github.com/undertow-io/undertow
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2275287
Undertow core Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2024-3884
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:6012
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:6011
access.redhat.com/errata/rhsa-2026:49... WEB
https://access.redhat.com/errata/RHSA-2026:4924
access.redhat.com/errata/rhsa-2026:49... WEB
https://access.redhat.com/errata/RHSA-2026:4917
access.redhat.com/errata/rhsa-2026:49... WEB
https://access.redhat.com/errata/RHSA-2026:4916
access.redhat.com/errata/rhsa-2026:49... WEB
https://access.redhat.com/errata/RHSA-2026:4915
access.redhat.com/errata/rhsa-2026:38... WEB
https://access.redhat.com/errata/RHSA-2026:3892
access.redhat.com/errata/rhsa-2026:38... WEB
https://access.redhat.com/errata/RHSA-2026:3891
access.redhat.com/errata/rhsa-2026:38... WEB
https://access.redhat.com/errata/RHSA-2026:3889
access.redhat.com/errata/rhsa-2026:03... WEB
https://access.redhat.com/errata/RHSA-2026:0386
access.redhat.com/errata/rhsa-2026:03... WEB
https://access.redhat.com/errata/RHSA-2026:0384
access.redhat.com/errata/rhsa-2026:03... WEB
https://access.redhat.com/errata/RHSA-2026:0383
access.redhat.com/errata/rhsa-2025:39... WEB
https://access.redhat.com/errata/RHSA-2025:3992
access.redhat.com/errata/rhsa-2025:39... WEB
https://access.redhat.com/errata/RHSA-2025:3990
access.redhat.com/errata/rhsa-2025:22... WEB
https://access.redhat.com/errata/RHSA-2025:22777
access.redhat.com/errata/rhsa-2025:22... WEB
https://access.redhat.com/errata/RHSA-2025:22775
access.redhat.com/errata/rhsa-2025:22... WEB
https://access.redhat.com/errata/RHSA-2025:22773

Frequently Asked Questions

What is CVE-2024-3884?
CVE-2024-3884 is a security vulnerability in Undertow core involving Undertow OutOfMemory when parsing form data encoding with application/x-www-form-urlencoded under CWE-20: Improper Input Validation.
Which Undertow core versions are affected?
Affected versions include releases prior to 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final across affected packages: io.undertow:undertow-core.
What version fixes CVE-2024-3884?
Upgrading to 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final (or the latest patched release for your respective branch) resolves the vulnerability.
Is undertow-core affected?
Yes, io.undertow:undertow-core is affected in releases prior to 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final. Upgrade your dependency to 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final or later.
What is the CVSS score of CVE-2024-3884?
CVE-2024-3884 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-3884?
CVE-2024-3884 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2024-3884?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.undertow'. 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 
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}