CVE-2026-28368

Undertow: undertow: request smuggling via inconsistent header parsing

Severity Score

8.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2026-02-27 CVE Reserved
2026-03-27 CVE Published
2026-04-08 CVE Updated
2026-04-28 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2026-28368	2026-03-31
https://bugzilla.redhat.com/show_bug.cgi?id=2443261	2026-03-31

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Build Of Apache Camel - Hawtio Search vendor "Redhat" for product "Build Of Apache Camel - Hawtio"				4.0 Search vendor "Redhat" for product "Build Of Apache Camel - Hawtio" and version "4.0"		-		Affected
Redhat Search vendor "Redhat"		Build Of Apache Camel For Spring Boot Search vendor "Redhat" for product "Build Of Apache Camel For Spring Boot"				4.0 Search vendor "Redhat" for product "Build Of Apache Camel For Spring Boot" and version "4.0"		-		Affected
Redhat Search vendor "Redhat"		Data Grid Search vendor "Redhat" for product "Data Grid"				8.0 Search vendor "Redhat" for product "Data Grid" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Fuse Search vendor "Redhat" for product "Fuse"				7.0.0 Search vendor "Redhat" for product "Fuse" and version "7.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Search vendor "Redhat" for product "Jboss Enterprise Application Platform"				7.0.0 Search vendor "Redhat" for product "Jboss Enterprise Application Platform" and version "7.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Search vendor "Redhat" for product "Jboss Enterprise Application Platform"				8.0.0 Search vendor "Redhat" for product "Jboss Enterprise Application Platform" and version "8.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Expansion Pack Search vendor "Redhat" for product "Jboss Enterprise Application Platform Expansion Pack"				-		-		Affected
Redhat Search vendor "Redhat"		Process Automation Search vendor "Redhat" for product "Process Automation"				7.0 Search vendor "Redhat" for product "Process Automation" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Single Sign-on Search vendor "Redhat" for product "Single Sign-on"				7.0 Search vendor "Redhat" for product "Single Sign-on" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Undertow Search vendor "Redhat" for product "Undertow"				-		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected