CVE-2026-47774

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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."}], "id": "CVE-2026-47774", "lastModified": "2026-10-26T11:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47774", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-17T18:00:56.896750Z", "version": "2.0.3"}}]}, "published": "2026-06-17T18:18:02.643", "references": [{"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-22m2-hvr2-xqc8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Mitigation", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/06/04/15"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:26210"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:26222"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:26231"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:26247"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:27114"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-47774"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487465"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47774.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-405"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-409"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "envoy: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack", "id": "2487465", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487465"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-409", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Disable HTTP/2 support on Envoy listeners where it is not strictly required, or deploy behind a CDN/reverse proxy that can absorb or rate-limit such attacks. Limiting the maximum number of concurrent streams and header list size via Envoy configuration can also reduce the attack surface."}, "name": "CVE-2026-47774", "package_state": [{"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Affected", "package_name": "openshift-service-mesh/proxyv2-rhel9", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-proxyv2-rhel9", "product_name": "OpenShift Service Mesh 3"}], "public_date": "2026-06-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47774\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47774"], "threat_severity": "Important"}

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