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CVE-2024-4027: Undertow Servlets Vulnerable to Remote DoS via OutOfMemoryError when Passed Large Parameter Names

January 30, 2026 (updated February 1, 2026)

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.

References

  • access.redhat.com/security/cve/CVE-2024-4027
  • bugzilla.redhat.com/show_bug.cgi?id=2276410
  • github.com/advisories/GHSA-33hj-rcmx-86mv
  • github.com/undertow-io/undertow
  • github.com/undertow-io/undertow/commit/6b7c18481ce65ae4012d92fe2b7f17a21ef4d70b
  • github.com/undertow-io/undertow/releases/tag/2.3.21.Final
  • issues.redhat.com/browse/UNDERTOW-2377
  • nvd.nist.gov/vuln/detail/CVE-2024-4027

Code Behaviors & Features

Detect and mitigate CVE-2024-4027 with GitLab Dependency Scanning

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Affected versions

All versions before 2.3.21.Final

Fixed versions

  • 2.3.21.Final

Solution

Upgrade to version 2.3.21.Final or above.

Impact 7.5 HIGH

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

Learn more about CVSS

Weakness

  • CWE-770: Allocation of Resources Without Limits or Throttling

Source file

maven/io.undertow/undertow-core/CVE-2024-4027.yml

Spotted a mistake? Edit the file on GitLab.

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