CVE-2026-47205

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From 1.36.0 until 1.36.9, 1.37.5, and 1.38.3, a Use-After-Free (UAF) vulnerability leading to a sudden segmentation fault exists in Envoy's ext_authz HTTP filter when processing per-route authorization overrides concurrently with rapid downstream client disconnects. During standard request lifecycles, Envoy instantiates the ext_authz filter with a foundational authorization client object (client_). If a matched route dictates a dynamic per-route HTTP or gRPC authorization service override, the filter generates a localized client. In the vulnerable implementation, this transient client aggressively overwrote the default client_ unique pointer by executing client_ = std::move(per_route_client). When a client rapidly establishes and subsequently tears down a stream (such as rapidly refreshing a protected WebSocket endpoint), the downstream triggers the ConnectionManagerImpl::doDeferredStreamDestroy() -> ActiveStream::onResetStream() lifecycle. Envoy immediately sequences Filter::onDestroy() in an attempt to securely abort dispatched asynchronous authorization check transactions via client_->cancel(). By destructing the default client abruptly during initiateCall, a memory lifecycle misalignment occurs within the async client manager. The stream teardown fails to reliably track and cancel the dynamically bound asynchronous authorization tasks, orchestrating a sequence where a late asynchronous callback from the network evaluates against a heavily destroyed ActiveStream validation span, generating a UAF process crash. This vulnerability is fixed in 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 1.36.0 hasta 1.36.9, 1.37.5 y 1.38.3, existe una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n (UAF) que conduce a un fallo de segmentaci\u00f3n repentino en el filtro HTTP ext_authz de Envoy al procesar anulaciones de autorizaci\u00f3n por ruta concurrentemente con desconexiones r\u00e1pidas de clientes descendentes. Durante los ciclos de vida de solicitud est\u00e1ndar, Envoy instancia el filtro ext_authz con un objeto cliente de autorizaci\u00f3n fundamental (client_). Si una ruta coincidente dicta una anulaci\u00f3n din\u00e1mica del servicio de autorizaci\u00f3n HTTP o gRPC por ruta, el filtro genera un cliente localizado. En la implementaci\u00f3n vulnerable, este cliente transitorio sobrescribi\u00f3 agresivamente el puntero \u00fanico client_ predeterminado al ejecutar client_ = std::move(per_route_client). Cuando un cliente establece y posteriormente cierra r\u00e1pidamente un flujo (como al actualizar r\u00e1pidamente un punto final WebSocket protegido), el descendente activa el ciclo de vida ConnectionManagerImpl::doDeferredStreamDestroy() -> ActiveStream::onResetStream(). Envoy secuencia inmediatamente Filter::onDestroy() en un intento de abortar de forma segura las transacciones de verificaci\u00f3n de autorizaci\u00f3n as\u00edncronas despachadas a trav\u00e9s de client_ -> cancel(). Al destruir el cliente predeterminado abruptamente durante initiateCall, se produce un desajuste del ciclo de vida de la memoria dentro del gestor de clientes as\u00edncronos. El cierre del flujo no logra rastrear y cancelar de forma fiable las tareas de autorizaci\u00f3n as\u00edncronas vinculadas din\u00e1micamente, orquestando una secuencia en la que una devoluci\u00f3n de llamada as\u00edncrona tard\u00eda de la red se eval\u00faa contra un lapso de validaci\u00f3n de ActiveStream fuertemente destruido, generando un fallo de proceso por UAF. Esta vulnerabilidad se corrige en 1.36.9, 1.37.5 y 1.38.3."}], "id": "CVE-2026-47205", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47205", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-27T02:54:07.255044Z", "version": "2.0.3"}}]}, "published": "2026-06-26T19:16:40.853", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory", "Exploit", "Mitigation"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-mvh9-767w-x47j"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory", "Exploit", "Mitigation"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-mvh9-767w-x47j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Envoy: ext_authz Use-After-Free during Stream Teardown with Per-Route Overrides", "id": "2493648", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493648"}, "csaw": false, "details": ["No description is available for this CVE."], "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-2026-47205", "package_state": [{"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Not affected", "package_name": "openshift-service-mesh/proxyv2-rhel9", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Not affected", "package_name": "openshift-service-mesh/istio-proxyv2-rhel9", "product_name": "OpenShift Service Mesh 3"}], "public_date": "2026-06-26T18:01:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47205\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47205\nhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-mvh9-767w-x47j"], "statement": "Red Hat products ship Envoy versions prior to 1.36.0, which do not contain the vulnerable ext_authz per-route override code introduced in 1.36.0. Red Hat products are therefore not affected by this vulnerability.", "threat_severity": "Moderate"}

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