ChangeIntel IT change radar
Public mode

No access to your tenant or devices. Every item links to its source. What this means

Sources need attention Customize Public modeDiscuss ChangeIntel on Discord
CVE-2026-28367

Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator

CVSS 3.1 8.7 HIGHCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-28367

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-28367

Published

io.undertow/undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1.6",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "io.undertow/undertow-core",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "2.3.24.SP2-redhat-00001",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1"
                    ]
                }

eap8-activemq-artemis

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-activemq-artemis",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.40.0-7.redhat_00015.1.el8eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-eap-product-conf-parent

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-eap-product-conf-parent",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:801.6.1-1.GA_redhat_00001.1.el8eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-undertow

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-undertow",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.3.24-3.SP2_redhat_00001.1.el8eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-wildfly

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-wildfly",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:8.1.6-7.GA_redhat_00010.1.el8eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-activemq-artemis

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-activemq-artemis",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.40.0-7.redhat_00015.1.el9eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-eap-product-conf-parent

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-eap-product-conf-parent",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:801.6.1-1.GA_redhat_00001.1.el9eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-undertow

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-undertow",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.3.24-3.SP2_redhat_00001.1.el9eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

eap8-wildfly

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "eap8-wildfly",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:8.1.6-7.GA_redhat_00010.1.el9eap",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8",
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat build of Apache Camel for Spring Boot 4",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:camel_spring_boot:4"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat build of Apache Camel - HawtIO 4",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:apache_camel_hawtio:4"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Data Grid 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_data_grid:8"
                    ]
                }

moditect

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Enterprise Linux 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "moditect",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:enterprise_linux:10"
                    ]
                }

pki-core:10.6/resteasy

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Enterprise Linux 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "pki-core:10.6/resteasy",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:enterprise_linux:8"
                    ]
                }

pki-deps:10.6/resteasy

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Enterprise Linux 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "pki-deps:10.6/resteasy",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:enterprise_linux:8"
                    ]
                }

resteasy

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Enterprise Linux 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "resteasy",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:enterprise_linux:9"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Fuse 7",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_fuse:7"
                    ]
                }

undertow-core

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 7",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:7"
                    ]
                }

org.jberet-jberet-parent

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "org.jberet-jberet-parent",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8"
                    ]
                }

undertow-core

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform 8",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8"
                    ]
                }

org.jberet-jberet-parent

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "org.jberet-jberet-parent",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jbosseapxp"
                    ]
                }

org.jboss.eap-jboss-eap-xp

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "org.jboss.eap-jboss-eap-xp",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jbosseapxp"
                    ]
                }

undertow-core

https://access.redhat.com/jbossnetwork/restricted/listSoftware.html

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "undertow-core",
                    "defaultStatus": "unaffected",
                    "cpes": [
                        "cpe:/a:redhat:jbosseapxp"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Process Automation 7",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_bpms:7"
                    ]
                }

undertow-core

https://access.redhat.com/downloads/content/package-browser/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Red Hat",
                    "product": "Red Hat Single Sign-On 7",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "undertow-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:red_hat_single_sign_on:7"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Nov 20:24 UTC · 264 of 275 readable · 261 fully read · documentation 469/469 current

No accounts or analytics; your preferences stay in your browser. Information, not advice. ChangeIntel is an independent tool and is not affiliated with or endorsed by Microsoft, Apple, Google, Broadcom (VMware), Jamf, Oracle, Mozilla, or any other vendor it covers. Product names are trademarks of their owners.