FKIE_CVE-2026-11946

Vulnerability from fkie_nvd - Published: 2026-07-02 12:16 - Updated: 2026-07-02 17:39
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configurations. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
References
a6d3dc9e-0591-4a13-bce7-0f5b31ff6158https://github.com/open62541/open62541
a6d3dc9e-0591-4a13-bce7-0f5b31ff6158https://github.com/open62541/open62541/pull/8142
a6d3dc9e-0591-4a13-bce7-0f5b31ff6158https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "open62541",
          "vendor": "open62541 project / o6 Automation GmbH",
          "versions": [
            {
              "lessThanOrEqual": "1.4.16",
              "status": "affected",
              "version": "1.4.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "1.5.4",
              "status": "affected",
              "version": "1.5.0",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "master",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"
    }
  ],
  "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\u00a0issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master."
    }
  ],
  "id": "CVE-2026-11946",
  "lastModified": "2026-07-02T17:39:07.620",
  "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": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-11946",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-02T12:15:40.618622Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-02T12:16:54.740",
  "references": [
    {
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "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"
    }
  ],
  "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        },
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ],
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "type": "Secondary"
    }
  ]
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.