CVE-2026-87849

{"id": "CVE-2026-87849", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-87849", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-26T13:54:35.426140Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache bRPC", "versions": [{"status": "affected", "version": "0", "lessThan": "1.18.0", "versionType": "semver"}], "packageURL": "pkg:github/apache/brpc", "packageName": "apache/brpc", "collectionURL": "https://github.com", "defaultStatus": "unaffected"}]}], "published": "2026-10-21T13:20:04.603", "references": [{"url": "https://github.com/apache/brpc/pull/3533", "source": "security@apache.org"}, {"url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb", "source": "security@apache.org"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "The Discovery naming-service reply parser in Apache bRPC (versions < 1.18.0) calls RapidJSON object-only accessors (FindMember) on JSON values without first validating that those values are objects. A malformed Discovery response whose data/service members or instances list contain non-object entries (e.g. a bare integer) triggers the RapidJSON object-access precondition on the client, reading memory out of bounds and potentially crashing the bRPC client.\n\nRoot Cause:\nIn src/brpc/policy/discovery_naming_service.cpp, DiscoveryNamingService::GetServers() and DiscoveryNames::ListDiscoveryNodes() access JSON values with member functions on non-object values. RapidJSON only defines these operations for object types; invoking them on a non-object violates the class invariant and results in undefined behavior (out-of-bounds read), commonly crashing the process.\n\nAffected Scenarios: \nAn operator-configured (or compromised) Discovery backend returns a malformed /discovery/nodes or /discovery/fetchs response whose data/service/instance entries are not JSON objects, crashing any bRPC client that refreshes its server list.\n\nHow to Fix:\n1. Upgrade bRPC to version 1.18.0 or later, which fixes this issue.\n2. Apply this patch: https://github.com/apache/brpc/pull/3533\n\nThe fix validates that the Discovery response data, per-service data, and instance entries are JSON objects (and skips non-object node/instance entries and rejects non-object data/service values) before calling member accessors."}, {"lang": "es", "value": "El analizador de respuestas del servicio de nombres Discovery en Apache bRPC (versiones anteriores a la 1.18.0) llama a los accesores de objeto \u00fanicamente de RapidJSON (FindMember) sobre valores JSON sin validar primero que esos valores sean objetos. Una respuesta Discovery malformada cuyo miembro data/service o la lista de instancias contenga entradas que no sean objetos (p.?ej., un entero simple) activa la precondici\u00f3n de acceso a objetos de RapidJSON en el cliente, leyendo memoria fuera de los l\u00edmites y potencialmente provocando el bloqueo del cliente bRPC.\\n\\nCausa ra\u00edz:\\nEn src/brpc/policy/discovery_naming_service.cpp, DiscoveryNamingService::GetServers() y DiscoveryNames::ListDiscoveryNodes() acceden a valores JSON con funciones de miembro sobre valores que no son objetos. RapidJSON solo define estas operaciones para tipos de objeto; invocarlas sobre un valor que no es objeto viola la invariancia de la clase y produce un comportamiento indefinido (lectura fuera de los l\u00edmites), lo que suele provocar el bloqueo del proceso.\\n\\nEscenarios afectados:\\nUn backend Discovery configurado por el operador (o comprometido) devuelve una respuesta /discovery/nodes o /discovery/fetchs malformada cuyos elementos data/service/instance no son objetos JSON, provocando el bloqueo de cualquier cliente bRPC que actualice su lista de servidores.\\n\\nC\u00f3mo corregirlo:\\n1. Actualice bRPC a la versi\u00f3n 1.18.0 o posterior, que corrige este problema.\\n2. Aplique este parche: https://github.com/apache/brpc/pull/3533\\n\\nLa correcci\u00f3n valida que los datos de la respuesta Discovery, los datos por servicio y las entradas de instancia sean objetos JSON (y omite las entradas de nodo/instancia que no son objetos y rechaza los valores data/service que no son objetos) antes de llamar a los accesores de miembro."}], "lastModified": "2026-10-26T20:10:00.160", "sourceIdentifier": "security@apache.org"}