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CVE-2026-76166

Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram

CVSS 3.1 4.3 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-76166

Published

A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-76166

Published

mod_cluster-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 Web Server 6.2.6",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "defaultStatus": "unaffected",
                    "packageName": "mod_cluster-core",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2"
                    ]
                }

jws6-mod_cluster

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 Web Server 6.2 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.0.5-1.Final_redhat_00001.1.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat

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 Web Server 6.2 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:10.1.49-18.redhat_00018.1.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat-native

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 Web Server 6.2 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.6-2.redhat_2.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-mod_cluster

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 Web Server 6.2 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.0.5-1.Final_redhat_00001.1.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat

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 Web Server 6.2 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:10.1.49-18.redhat_00018.1.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat-native

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 Web Server 6.2 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.6-2.redhat_2.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-mod_cluster

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 Web Server 6.2 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.0.5-1.Final_redhat_00001.1.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat

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 Web Server 6.2 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:10.1.49-18.redhat_00018.1.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

jws6-tomcat-native

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 Web Server 6.2 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws6-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.6-2.redhat_2.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
                    ]
                }

mod_cluster-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 Web Server 7.0.3",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "defaultStatus": "unaffected",
                    "packageName": "mod_cluster-core",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0"
                    ]
                }

jws7-mod_cluster

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 Web Server 7.0 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.1.1-1.Final_redhat_00001.1.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat

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 Web Server 7.0 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:11.0.21-10.redhat_00010.1.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat-native

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 Web Server 7.0 on RHEL 10",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.7-4.redhat_4.el10jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-mod_cluster

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 Web Server 7.0 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.1.1-1.Final_redhat_00001.1.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat

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 Web Server 7.0 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:11.0.21-10.redhat_00010.1.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat-native

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 Web Server 7.0 on RHEL 8",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.7-4.redhat_4.el8jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-mod_cluster

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 Web Server 7.0 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-mod_cluster",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:2.1.1-1.Final_redhat_00001.1.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat

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 Web Server 7.0 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:11.0.21-10.redhat_00010.1.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

jws7-tomcat-native

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 Web Server 7.0 on RHEL 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "jws7-tomcat-native",
                    "defaultStatus": "affected",
                    "versions": [
                        {
                            "version": "0:1.3.7-4.redhat_4.el9jws",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
                        "cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
                    ]
                }

mod_cluster-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": "mod_cluster-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:7"
                    ]
                }

mod_cluster-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": "mod_cluster-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_application_platform:8"
                    ]
                }

mod_cluster-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": "mod_cluster-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:jbosseapxp"
                    ]
                }

mod_cluster-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 Web Server 5",
                    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
                    "packageName": "mod_cluster-core",
                    "defaultStatus": "unknown",
                    "cpes": [
                        "cpe:/a:redhat:jboss_enterprise_web_server:5"
                    ]
                }

mod_cluster-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": "mod_cluster-core",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/a:redhat:red_hat_single_sign_on:7"
                    ]
                }

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

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