CVE-2026-47221

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{"affected": [{"affectedData": [{"product": "envoy", "vendor": "envoyproxy", "versions": [{"status": "affected", "version": ">= 1.38.0, < 1.38.3"}, {"status": "affected", "version": ">= 1.37.0, < 1.37.5"}, {"status": "affected", "version": ">= 1.36.0, < 1.36.9"}, {"status": "affected", "version": ">= 1.18.0, < 1.35.13"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "F5FC4474-33FC-43D6-9814-3B713466DDDD", "versionEndExcluding": "1.35.13", "versionStartIncluding": "1.18.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "B1146A14-3C49-48C3-BC2A-1BBB202EBD84", "versionEndExcluding": "1.36.9", "versionStartIncluding": "1.36.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "2057BF79-00D1-4154-9DC0-3F278C72F4E1", "versionEndExcluding": "1.37.5", "versionStartIncluding": "1.37.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "2A218AD4-BF4B-46EA-96D7-3B25B7E71AC8", "versionEndExcluding": "1.38.3", "versionStartIncluding": "1.38.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP 303, the redirect handling code attempts to drain a request body buffer that was never allocated. This results in a segmentation fault that crashes the entire Envoy process. When route configured with internal_redirect_policy including 303 in redirect_response_codes and upstream must return HTTP 303 response, an unauthenticated attacker can exploit this to cause complete denial of service, terminating all active connections. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3."}, {"lang": "es", "value": "Envoy es un proxy de borde y de servicio de c\u00f3digo abierto dise\u00f1ado para aplicaciones nativas de la nube. Desde 1.18.0 hasta 1.35.13, 1.36.9, 1.37.5 y 1.38.3, el filtro del router contiene una vulnerabilidad de desreferencia de puntero nulo al manejar redirecciones internas HTTP 303 (Ver Otros) para solicitudes sin cuerpo que no son GET/HEAD. Cuando una solicitud POST, PUT, DELETE o PATCH sin cuerpo se env\u00eda a una ruta configurada con una pol\u00edtica de redirecci\u00f3n interna que incluye 303 en redirect_response_codes, y el origen responde con HTTP 303, el c\u00f3digo de manejo de redirecci\u00f3n intenta vaciar un b\u00fafer de cuerpo de solicitud que nunca fue asignado. Esto resulta en un fallo de segmentaci\u00f3n que bloquea todo el proceso de Envoy. Cuando una ruta configurada con internal_redirect_policy que incluye 303 en redirect_response_codes y el origen debe devolver una respuesta HTTP 303, un atacante no autenticado puede explotar esto para causar una denegaci\u00f3n de servicio completa, terminando todas las conexiones activas. Esta vulnerabilidad se corrige en 1.35.13, 1.36.9, 1.37.5 y 1.38.3."}], "id": "CVE-2026-47221", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47221", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-26T18:33:10.549936Z", "version": "2.0.3"}}]}, "published": "2026-06-26T18:16:59.087", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "envoy: Envoy: Null pointer deref in internal redirects", "id": "2493646", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493646"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP 303, the redirect handling code attempts to drain a request body buffer that was never allocated. This results in a segmentation fault that crashes the entire Envoy process. When route configured with internal_redirect_policy including 303 in redirect_response_codes and upstream must return HTTP 303 response, an unauthenticated attacker can exploit this to cause complete denial of service, terminating all active connections. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.", "A flaw was found in Envoy. An unauthenticated attacker can exploit a null pointer dereference vulnerability in the router filter. This occurs when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. By sending a POST, PUT, DELETE, or PATCH request without a body to a specially configured route, and if the upstream responds with HTTP 303, the Envoy process will crash. This leads to a complete denial of service, terminating all active connections."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-47221", "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": "2026-06-26T17:35:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47221\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47221\nhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-rcff-gw58-pjpr"], "statement": "Moderate: An unauthenticated attacker can trigger a denial of service in Envoy. This is due to a null pointer dereference when handling HTTP 303 internal redirects for body-less non-GET/HEAD requests, leading to a crash of the Envoy process. This vulnerability affects Envoy deployments configured with an internal redirect policy that includes HTTP 303 in `redirect_response_codes`.", "threat_severity": "Moderate"}

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