---
id: CVE-2026-28368
title: A flaw was found in Undertow
summary: >-
  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
  interpretati…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-444
vendor: redhat
product: build_of_apache_camel_-_hawtio
affected:
  - build_of_apache_camel_-_hawtio = 4.0
  - build_of_apache_camel_for_spring_boot = 4.0
  - data_grid = 8.0
  - fuse = 7.0.0
  - jboss_enterprise_application_platform = 7.0.0
  - jboss_enterprise_application_platform = 8.0.0
  - jboss_enterprise_application_platform_expansion_pack
  - process_automation = 7.0
  - single_sign-on = 7.0
  - undertow
  - enterprise_linux = 9.0
published: '2026-03-27'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:15.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-28368'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:25125'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:25126'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-28368'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2443261'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28368.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-28368'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-28368'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-03-27T18:49:45.702271Z'
epss: 0.00704
epssPercentile: 0.51917
ingestedAt: '2026-06-29T13:24:34.816Z'
patched:
  - jboss_eap_8_1_for_rhel 8
  - jboss_eap_8_1_for_rhel 9
  - jboss_enterprise_application_platform 8.1.7.GA
---

## Overview

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.

## Affected

- `build_of_apache_camel_-_hawtio = 4.0`
- `build_of_apache_camel_for_spring_boot = 4.0`
- `data_grid = 8.0`
- `fuse = 7.0.0`
- `jboss_enterprise_application_platform = 7.0.0`
- `jboss_enterprise_application_platform = 8.0.0`
- `jboss_enterprise_application_platform_expansion_pack`
- `process_automation = 7.0`
- `single_sign-on = 7.0`
- `undertow`
- `enterprise_linux = 9.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:25125** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 8, Red Hat JBoss EAP 8.1 for RHEL 9 · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:25125)
- **RHSA-2026:25126** · Red Hat · fixed in: Red Hat JBoss Enterprise Application Platform 8.1.7.GA · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:25126)
- **Red Hat VEX** · Important · affected: Red Hat build of Apache Camel for Spring Boot 4, Red Hat Data Grid 8, Red Hat Enterprise Linux 9, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat JBoss Enterprise Application Platform 8, … · no fix planned: Red Hat Data Grid 8, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Process Automation 7, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28368.json)