CVE-2026-11946

{
  "id": "CVE-2026-11946",
  "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
  "published": "2026-07-02T12:16:54.740",
  "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 GetEndpoints Discovery Service in open62541. The\nendpointUrl field of GetEndpointsRequest is not validated for length. An\nattacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32\nlength field) delivered across intermediate chunks without ever sending the\nfinal chunk. The server buffers all chunks in RAM indefinitely until the\nSecureChannel times out. The attack is\npre-session and bypasses all encryption configurations.\n\n\n\nThe 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 GetEndpoints en open62541. El campo endpointUrl de GetEndpointsRequest no se valida en cuanto a su longitud. Un atacante puede declarar una cadena arbitrariamente grande (hasta ~4.09 GB a través del campo de longitud UInt32) 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 elude todas las configuraciones de cifrado.\n\nEl 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": "2026-07-02T12:15:40.618622Z",
          "id": "CVE-2026-11946",
          "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"
    }
  ]
}