Vulnerabilities in pkg:maven/io.undertow/undertow-parent
PACKAGECVE-2026-28367 is a HIGH (CVSS 8.7) undertow is vulnerable to http vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Undertow parent libraries in the Maven ecosystem. The issue involves undertow is vulnerable to http request/response smuggling. Remediation is available in the latest vendor maintenance releases.
pkg:maven/io.undertow/undertow-parent
Vulnerability advisories affecting package pkg:maven/io.undertow/undertow-parent. Select an advisory below to view technical details or fixes.
| Advisory ID | CVE / NVD | Severity | Summary |
|---|---|---|---|
| GHSA-3gv6-g396-9v4r | CVE-2026-28367 | HIGH | Undertow is Vulnerable to HTTP Request/Response Smuggling |
| GHSA-8v4x-mgvp-p658 | CVE-2026-28368 | HIGH | Undertow is Vulnerable to HTTP Request/Response Smuggling |
| GHSA-vqqj-9cmv-hx43 | CVE-2026-28369 | HIGH | Undertow is Vulnerable to HTTP Request/Response Smuggling |
| GHSA-65h2-wf7m-q2v8 | CVE-2023-3223 | HIGH | Undertow vulnerable to denial of service |
CVE-2026-28367 at a Glance
Security Impact
CVSS: 8.7
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N).
How to Fix CVE-2026-28367
To remediate this vulnerability, upgrade all affected Undertow parent dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-parent</artifactId>
<version>Latest secure release</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=io.undertowHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-28367, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=io.undertowAnalyze the terminal output to locate any version of Undertow parent in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree -Dincludes=io.undertow command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. In Undertow parent, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-28367 Affected Undertow parent Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
io.undertow:undertow-parent
|
Maven |
≤ 2.3.23.Final
|
|
References
Frequently Asked Questions
What is CVE-2026-28367?
Which Undertow parent versions are affected?
What version fixes CVE-2026-28367?
Is undertow-parent affected?
What is the CVSS score of CVE-2026-28367?
What CWE is associated with CVE-2026-28367?
How can I check Maven dependencies for CVE-2026-28367?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-3gv6-g396-9v4r",
"modified" : "2026-06-11T00:32:03Z",
"published" : "2026-03-27T18:31:27Z",
"aliases" : [ "CVE-2026-28367" ],
"summary" : "Undertow is Vulnerable to HTTP Request/Response Smuggling",
"details" : "A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\\r\\r\\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "io.undertow:undertow-parent"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "2.3.23.Final"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-28367"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:25125"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:25126"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-28367"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2443260"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/undertow-io/undertow"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-444" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-31T23:13:55Z",
"nvd_published_at" : "2026-03-27T17:16:27Z"
}
}