GHSA-33hj-rcmx-86mvHighCVSS 7.5

Undertow Servlets Vulnerable to Remote DoS via OutOfMemoryError when Passed Large Parameter Names

Published
January 30, 2026
Last Modified
February 25, 2026

🔗 CVE IDs covered (1)

📋 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.

🎯 Affected products3

  • maven/io.undertow:undertow-core:< 2.2.39.Final
  • maven/io.undertow:undertow-core:= 2.4.0.Alpha1
  • maven/io.undertow:undertow-core:>= 2.3.0.Alpha1, < 2.3.21.Final

🔗 References (15)