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Vulnerability record · CVE-2024-4027 · published 30 January 2026

CVE-2024-4027: Improper input validation vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.39% · top 69.3% CWE-20 · Improper input validation Deferred
7.5CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
1 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2024-4027
https://bugzilla.redhat.com/show_bug.cgi?id=2276410
https://access.redhat.com/security/cve/CVE-2024-4027
https://bugzilla.redhat.com/show_bug.cgi?id=2276410
https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-4027.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-4027), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.