CVE-2026-47774

{"id": "CVE-2026-47774", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47774", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-17T18:00:56.896750Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": 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"openshift-service-mesh/proxyv2-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:service_mesh:3.0::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Service Mesh 3.0", "versions": [{"status": "unaffected", "version": "1781069908", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift-service-mesh/istio-proxyv2-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:service_mesh:3.1::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Service Mesh 3.1", "versions": [{"status": "unaffected", "version": "1781070158", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift-service-mesh/istio-proxyv2-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:service_mesh:3.2::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Service Mesh 3.2", "versions": [{"status": "unaffected", "version": "1781070967", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift-service-mesh/istio-proxyv2-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:service_mesh:3.3::el9"], "vendor": "Red Hat", "product": "Red Hat OpenShift Service Mesh 3.3", "versions": [{"status": "unaffected", "version": "1781094520", "lessThan": "*", "versionType": "rpm"}], "packageName": "openshift-service-mesh/istio-proxyv2-rhel9", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}]}], "published": "2026-06-17T18:18:02.643", "references": [{"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-22m2-hvr2-xqc8", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/04/15", "tags": ["Mailing List", "Mitigation", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26210", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26222", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26231", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26247", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:27114", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-47774", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487465", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47774.json", "tags": ["Third Party Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-405"}, {"lang": "en", "value": "CWE-770"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-409"}]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability in Envoy's HTTP/2 downstream request processing allows an unauthenticated remote client to trigger excessive memory consumption, potentially resulting in OOM termination of the Envoy process and denial of service. The issue arises from the combination of two behaviors. First, cookie header bytes are not fully accounted for during request header size validation in Envoy. Second, HPACK header block limits in oghttp2/quiche are enforced on encoded bytes without a corresponding limit on total decoded header size. Together, these behaviors allow a malicious client to cause large decoded header allocations while bypassing the intended request header size protections. Versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1 contain a fix. No complete workaround is known short of applying a fix. Possible temporary mitigations include disabling downstream HTTP/2 where operationally feasible; enforcing stricter request header and cookie limits before traffic reaches Envoy; and monitoring Envoy memory usage for abnormal growth under HTTP/2 traffic."}, {"lang": "es", "value": "Envoy es un proxy de borde y de servicio de c\u00f3digo abierto dise\u00f1ado para aplicaciones nativas de la nube. Antes de las versiones 1.35.11, 1.36.7, 1.37.3 y 1.38.1, una vulnerabilidad en el procesamiento de solicitudes HTTP/2 descendentes de Envoy permite a un cliente remoto no autenticado activar un consumo excesivo de memoria, lo que podr\u00eda resultar en la terminaci\u00f3n OOM del proceso de Envoy y denegaci\u00f3n de servicio. El problema surge de la combinaci\u00f3n de dos comportamientos. Primero, los bytes del encabezado de la cookie no se contabilizan completamente durante la validaci\u00f3n del tama\u00f1o del encabezado de la solicitud en Envoy. Segundo, los l\u00edmites del bloque de encabezado HPACK en oghttp2/quiche se aplican a los bytes codificados sin un l\u00edmite correspondiente en el tama\u00f1o total del encabezado decodificado. Juntos, estos comportamientos permiten a un cliente malicioso causar grandes asignaciones de encabezados decodificados mientras elude las protecciones de tama\u00f1o de encabezado de solicitud previstas. Las versiones 1.35.11, 1.36.7, 1.37.3 y 1.38.1 contienen una correcci\u00f3n. No se conoce ninguna soluci\u00f3n alternativa completa que no sea aplicar una correcci\u00f3n. Las posibles mitigaciones temporales incluyen deshabilitar HTTP/2 descendente donde sea operacionalmente factible; aplicar l\u00edmites m\u00e1s estrictos para los encabezados de solicitud y las cookies antes de que el tr\u00e1fico llegue a Envoy; y monitorear el uso de memoria de Envoy para detectar un crecimiento anormal bajo tr\u00e1fico HTTP/2."}], "lastModified": "2026-10-26T11:10:00.157", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7228260-24CC-44ED-8805-D913C775F342", "versionEndExcluding": "1.35.11"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C0A19272-7178-4FCE-A4D3-5E578A871D4D", "versionEndExcluding": "1.36.7", "versionStartIncluding": "1.36.0"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24F12FF2-A40F-4C2C-B9C4-F59A22B99843", "versionEndExcluding": "1.37.3", "versionStartIncluding": "1.37.0"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:1.38.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8AD655E3-C12A-42B5-948D-442C6AF3469D"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FFD517BC-CA76-4E2B-BDA5-60A9A2E35183", "versionEndExcluding": "2.6.17", "versionStartIncluding": "2.6"}, {"criteria": "cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6236CEDD-4A16-4232-97FE-59BBA2F639C1", "versionEndExcluding": "3.0.12", "versionStartIncluding": "3.0"}, {"criteria": "cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8A5586D-5F6B-48E9-B0E7-66A2C53272DF", "versionEndExcluding": "3.1.9", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9F44E8AD-F96C-4083-ADA4-6E8F93FA4149", "versionEndExcluding": "3.2.6", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9EDC21C9-C155-4A6E-8EFA-47CD399312D4", "versionEndExcluding": "3.3.4", "versionStartIncluding": "3.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}