CVE-2026-33592

{
  "id": "CVE-2026-33592",
  "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
  "published": "2026-07-02T08:16:39.230",
  "lastModified": "2026-10-25T21:10:00.770",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An unauthenticated remote attacker can exhaust\nserver memory via the FindServers Discovery Service in open62541. The\nserverUris field of FindServersRequest is not validated for length or array\nsize. An attacker can declare an arbitrarily large string (up to ~3.9 GB)\ndelivered across intermediate chunks without ever sending the final chunk. The\nserver buffers all chunks in RAM indefinitely until the SecureChannel times\nout. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master."
    },
    {
      "lang": "es",
      "value": "Un atacante remoto no autenticado puede agotar la memoria del servidor a través del servicio de descubrimiento FindServers en open62541. El campo serverUris de FindServersRequest no se valida en cuanto a longitud o tamaño de array. Un atacante puede declarar una cadena de caracteres arbitrariamente grande (hasta ~3.9 GB) entregada a través de fragmentos intermedios sin enviar nunca el fragmento final. El servidor almacena en búfer todos los fragmentos en la RAM indefinidamente hasta que el SecureChannel agota el tiempo de espera. El ataque es pre-sesión y omite toda la configuración de cifrado. El problema afecta a open62541: desde 1.4.0 hasta 1.4.16, desde 1.5.0 hasta 1.5.4, master."
    }
  ],
  "affected": [
    {
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "affectedData": [
        {
          "vendor": "open62541 project / o6 Automation GmbH",
          "product": "open62541",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1.4.0",
              "lessThanOrEqual": "1.4.16",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "1.5.0",
              "lessThanOrEqual": "1.5.4",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "master",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "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": "2026-07-02T12:29:37.308768Z",
          "id": "CVE-2026-33592",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        },
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/open62541/open62541",
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"
    },
    {
      "url": "https://github.com/open62541/open62541/pull/8142",
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"
    },
    {
      "url": "https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae",
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"
    }
  ]
}