CVE-2026-28369 Undertow: undertow: request smuggling via malformed http request headers
A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.
Problem types: cwe_id: CWE-444
description: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected products: vendor: Red Hat
product: Red Hat build of Apache Camel for Spring Boot 4
cpes: cpe:/a:redhat:camel_spring_boot:4
default_status: affected
vendor: Red Hat
product: Red Hat build of Apache Camel - HawtIO 4
cpes: cpe:/a:redhat:apache_camel_hawtio:4
default_status: unaffected
vendor: Red Hat
product: Red Hat Data Grid 8
cpes: cpe:/a:redhat:jboss_data_grid:8
default_status: affected
vendor: Red Hat
product: Red Hat Enterprise Linux 10
cpes: cpe:/o:redhat:enterprise_linux:10
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 8
cpes: cpe:/o:redhat:enterprise_linux:8
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 8
cpes: cpe:/o:redhat:enterprise_linux:8
default_status: unaffected
vendor: Red Hat
product: Red Hat Enterprise Linux 9
cpes: cpe:/o:redhat:enterprise_linux:9
default_status: affected
vendor: Red Hat
product: Red Hat Fuse 7
cpes: cpe:/a:redhat:jboss_fuse:7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 7
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:7
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform 8
cpes: cpe:/a:redhat:jboss_enterprise_application_platform:8
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform Expansion Pack
cpes: cpe:/a:redhat:jbosseapxp
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform Expansion Pack
cpes: cpe:/a:redhat:jbosseapxp
default_status: affected
vendor: Red Hat
product: Red Hat JBoss Enterprise Application Platform Expansion Pack
cpes: cpe:/a:redhat:jbosseapxp
default_status: affected
vendor: Red Hat
product: Red Hat Process Automation 7
cpes: cpe:/a:redhat:jboss_enterprise_bpms_platform:7
default_status: affected
vendor: Red Hat
product: Red Hat Single Sign-On 7
cpes: cpe:/a:redhat:red_hat_single_sign_on:7
default_status: affected
CVSS v3.1: attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 8.7
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
version: 3.1
Published: 2026-03-27T16:13:05.719Z