CVE-2026-28367 Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator
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.
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: unaffected
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: 2026-03-27T16:13:05.108Z