CVE-2024-4027
Unknown Unknown - Not Provided
OutOfMemoryError DoS in Undertow via Large Parameter Names

Publication date: 2026-01-30

Last updated on: 2026-01-30

Assigner: Red Hat, Inc.

Description
A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.
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Meta Information
Published
2026-01-30
Last Modified
2026-01-30
Generated
2026-06-16
AI Q&A
2026-01-30
EPSS Evaluated
2026-06-15
NVD
CVE-2024-4027
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
unknown_vendor undertow *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 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.
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Executive Summary

This vulnerability is a flaw in Undertow where servlets that use a method calling HttpServletRequestImpl.getParameterNames() can trigger an OutOfMemoryError if a client sends a request with very large parameter names. This can be exploited remotely by an unauthorized user to cause a denial-of-service (DoS) attack.

Impact Analysis

The vulnerability can impact you by allowing an unauthorized attacker to remotely cause a denial-of-service (DoS) condition on your server, potentially making your application unavailable due to an OutOfMemoryError.

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