CVE-2024-4027
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductIo.undertow:undertow-core
PublishedJan 30, 2026
First seenJan 30, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- io.undertow:undertow-core2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| io.undertow:undertow-coreMaven | v < 2.2.39.Final, 2.4.0.Alpha1 ≤ v < 2.4.0.Beta1, 2.3.0.Alpha1 ≤ v < 2.3.21.Final | 2.2.39.Final, 2.4.0.Beta1, 2.3.21.Final |
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