CVE-2026-74758

{
  "id": "CVE-2026-74758",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-21T12:17:22.863",
  "lastModified": "2026-10-30T17:17:28.090",
  "vulnStatus": "Deferred",
  "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:  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 después de liberación 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 caída de un servidor bRPC RTMP enviando un mensaje de control Abort manipulado. No se requiere autenticación ni solicitud a nivel de aplicación.\\n\\nCausa raíz:\\nCuando un mensaje de control Abort de RTMP nombra el flujo de fragmentos que se está 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 ejecución. Después de que el manejador del mensaje devuelve, Feed() continúa accediendo a miembros del objeto eliminado, lo que produce un uso después de liberación 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\\nCómo corregir:\\n1. Actualizar bRPC a la versión 1.18.0, que corrige este problema.  \\n2. Aplicar este parche: https://github.com/apache/brpc/pull/3452  \\n\\nLa corrección omite la limpieza del flujo de fragmentos cuando el mensaje Abort tiene como objetivo el flujo de fragmentos que se está analizando en ese momento."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache bRPC",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com",
          "packageName": "apache/brpc",
          "packageURL": "pkg:github/apache/brpc",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.18.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-30T16:45:05.389186Z",
          "id": "CVE-2026-74758",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
      "source": "[email protected]"
    }
  ]
}