CVE-2026-74758

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{"affected": [{"affectedData": [{"collectionURL": "https://github.com", "defaultStatus": "unaffected", "packageName": "apache/brpc", "packageURL": "pkg:github/apache/brpc", "product": "Apache bRPC", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "1.18.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A heap use-after-free in the RTMP protocol component of Apache bRPC (versions < 1.18.0) allows a remote attacker to crash a bRPC RTMP server by sending a crafted Abort control message. No authentication or application-level request is required.\n\nRoot Cause:\nWhen an RTMP Abort control message names the chunk stream that is currently being parsed (the chunk stream carrying the message itself), RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the RtmpChunkStream while its Feed() is still running. After the message handler returns, Feed() continues to access members of the deleted object, resulting in a heap-use-after-free.\n\nAffected Scenarios:\nbRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.\n\nHow to Fix:\n1. Upgrade bRPC to version 1.18.0, which fixes this issue.\n2. Apply this patch:\u00a0 https://github.com/apache/brpc/pull/3452 \n\nThe fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed."}, {"lang": "es", "value": "Una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n en el heap en el componente del protocolo RTMP de Apache bRPC (versiones anteriores a la 1.18.0) permite a un atacante remoto provocar una ca\u00edda de un servidor bRPC RTMP enviando un mensaje de control Abort manipulado. No se requiere autenticaci\u00f3n ni solicitud a nivel de aplicaci\u00f3n.\\n\\nCausa ra\u00edz:\\nCuando un mensaje de control Abort de RTMP nombra el flujo de fragmentos que se est\u00e1 analizando (el flujo de fragmentos que transporta el propio mensaje), RtmpChunkStream::OnAbortMessage llama a RtmpContext::ClearChunkStream, que elimina el RtmpChunkStream mientras su Feed() sigue en ejecuci\u00f3n. Despu\u00e9s de que el manejador del mensaje devuelve, Feed() contin\u00faa accediendo a miembros del objeto eliminado, lo que produce un uso despu\u00e9s de liberaci\u00f3n en el heap.\\n\\nEscenarios afectados:\\nServidores bRPC que habilitan el soporte RTMP (ServerOptions.rtmp_service configurado) y aceptan conexiones desde redes no confiables.\\n\\nC\u00f3mo corregir:\\n1. Actualizar bRPC a la versi\u00f3n 1.18.0, que corrige este problema. \\n2. Aplicar este parche: https://github.com/apache/brpc/pull/3452 \\n\\nLa correcci\u00f3n omite la limpieza del flujo de fragmentos cuando el mensaje Abort tiene como objetivo el flujo de fragmentos que se est\u00e1 analizando en ese momento."}], "id": "CVE-2026-74758", "lastModified": "2026-10-30T17:17:28.090", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74758", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-30T16:45:05.389186Z", "version": "2.0.3"}}]}, "published": "2026-10-21T12:17:22.863", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security@apache.org", "type": "Secondary"}]}

{}

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