CVE-2026-76166

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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."}], "affected": [{"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"]}, {"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"]}, {"vendor": "Red Hat", "product": "Red Hat JBoss Web 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"packageName": "mod_cluster-core", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:jbosseapxp"]}, {"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"]}, {"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"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:93618", "name": "RHSA-2026:93618", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:93622", "name": "RHSA-2026:93622", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:96228", "name": 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When advertisement must be enabled, ensure the multicast network segment (default 224.0.1.105:23364) is properly isolated and not accessible from untrusted network segments."}], "timeline": [{"lang": "en", "time": "2026-07-23T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-04T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Kien Pham (Ninh Thanh Cyber Security (NTCS)) and Ta Duc Thien (Ninh Thanh Cyber Security (NTCS)) for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-09T23:15:27.629Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-20T14:19:26.119248Z", "id": "CVE-2026-76166", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-20T15:23:41.023Z"}}]}}

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Un \u00fanico datagrama multicast UDP manipulado con una l\u00ednea de estado HTTP v\u00e1lida y una cabecera \u2019Server:\u2019 pero sin las cabeceras \u2019Date:\u2019, \u2019Digest:\u2019 y \u2019Sequence:\u2019 desencadena una NullPointerException en verifyDigest() que no es capturada por el gestor de excepciones del hilo de trabajo. Esto provoca que el hilo del oyente de anuncios termine permanentemente. El fallo es silencioso (isListening() contin\u00faa devolviendo true) y persiste hasta que se reinicia el nodo. El bloqueo ocurre antes de la comparaci\u00f3n de AdvertiseSecurityKey, por lo que las implementaciones con una clave de seguridad configurada siguen estando afectadas."}], "id": "CVE-2026-76166", "lastModified": "2026-11-10T00:17:15.903", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-76166", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T14:19:26.119248Z", "version": "2.0.3"}}]}, "published": "2026-08-19T10:16:38.150", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:93618"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:93622"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:96228"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:96229"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-76166"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510883"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

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