CVE-2026-82210

{
  "id": "CVE-2026-82210",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-21T13:20:02.837",
  "lastModified": "2026-10-30T15:16:55.473",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Enforceable assertion in the streaming feature of Apache bRPC (version < 1.18.0) on all platforms allows a remote attacker to crash the server process by sending a malformed stream feedback frame.\n\nRoot Cause:\nWhen handling FRAME_TYPE_FEEDBACK frames, bRPC calls Stream::SetRemoteConsumed() which contains CHECK(_cur_buf_size > 0) and unconditionally asserts CHECK(buf.IsEmpty()) on the frame payload. A feedback frame that carries an unexpected payload, or a feedback frame received on a stream where flow control is disabled (cur_buf_size == 0), reaches these assertions. On failure, CHECK failures abort the process, allowing an unauthenticated single client (once a stream is established) to terminate the server and cause a denial of service.\n\nAffected Scenarios:\nUse bRPC server with the streaming control feature (Stream API) served from untrusted network.\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/3494 \n\nThe fix rejects malformed feedback frames with EPROTO and closes only the affected stream instead of crashing the whole process, and it bounds buffer shrinking so cur_buf_size never drops to 0 while flow control is enabled."
    },
    {
      "lang": "es",
      "value": "Una aserción exigible en la funcionalidad de streaming de Apache bRPC (versiones anteriores a la 1.18.0) en todas las plataformas permite a un atacante remoto causar una caída del proceso del servidor enviando un marco de retroalimentación de streaming malformado.\\n\\nCausa raíz:\\nAl manejar tramas FRAME_TYPE_FEEDBACK, bRPC llama a Stream::SetRemoteConsumed() que contiene CHECK(_cur_buf_size mayor que 0) y afirma incondicionalmente CHECK(buf.IsEmpty()) sobre la carga útil de la trama. Una trama de retroalimentación que lleva una carga inesperada, o una trama de retroalimentación recibida en un flujo donde el control de flujo está deshabilitado (cur_buf_size == 0), alcanza estas aserciones. En caso de fallo, los errores CHECK abortan el proceso, permitiendo a un único cliente no autenticado (una vez establecido el flujo) terminar el servidor y provocar una denegación de servicio.\\n\\nEscenarios afectados:\\nUtilizar el servidor bRPC con la funcionalidad de control de streaming (API Stream) expuesto desde una red no confiable.\\n\\nCómo solucionar:\\n1. Actualizar bRPC a la versión 1.18.0, que corrige este problema.\\n2. Aplicar este parche: https://github.com/apache/brpc/pull/3494\\n\\nLa corrección rechaza tramas de retroalimentación malformadas con EPROTO y cierra solo el flujo afectado en lugar de bloquear todo el proceso, y limita la reducción del búfer de modo que cur_buf_size nunca llegue a 0 mientras el control de flujo está habilitado."
    }
  ],
  "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": "2026-10-30T14:25:32.031437Z",
          "id": "CVE-2026-82210",
          "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-617"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
      "source": "[email protected]"
    }
  ]
}