---
id: CVE-2024-3884
title: A flaw was found in Undertow that can cause remote denial of service attacks
summary: >-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-20
published: '2025-12-03'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-3884'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:0383'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0384'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0386'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:3889'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:3891'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:3892'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:4915'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:4916'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:4917'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:4924'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:6011'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:6012'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2024-3884'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2275287'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.01359
epssPercentile: 0.70509
ingestedAt: '2026-07-24T04:20:27.271Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.