o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

{
  "id": "bb62d7ca221fd63c89ff4749a9468025cbe3a6075da62851c1910d30d66ad766",
  "url": "https://osv.dev/vulnerability/CVE-2026-18784",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow",
    "summary": "A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.",
    "evidence": "osv:CVE-2026-18784",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-18784",
      "aliases": [
        "CVE-2026-18784"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open62541/open62541",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b90fbfac5ef484089447bf5e3fe6ad7baaaebada"
                },
                {
                  "last_affected": "3bdeed5dfe8309cecabf36e04afe956b7f72ebd8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.5.0"
                      },
                      {
                        "last_affected": "1.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.1"
                      },
                      {
                        "last_affected": "1.5.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.2"
                      },
                      {
                        "last_affected": "1.5.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.3"
                      },
                      {
                        "last_affected": "1.5.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.4"
                      },
                      {
                        "last_affected": "1.5.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.5"
                      },
                      {
                        "last_affected": "1.5.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "62541"
                      },
                      {
                        "last_affected": "1.5.5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.5.0",
            "1.5.1",
            "1.5.2",
            "1.5.3",
            "1.5.4",
            "1.5.5",
            "v1.5.5",
            "v1.5.4",
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18784.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.255734204Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18784.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18784",
        "https://vuldb.com/cve/CVE-2026-18784",
        "https://vuldb.com/submit/857012",
        "https://vuldb.com/vuln/385786",
        "https://github.com/gff-cw/information/issues/11",
        "https://github.com/open62541/open62541/issues/8139",
        "https://vuldb.com/vuln/385786/cti"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-119",
          "CWE-122"
        ],
        "cna_assigner": "VulDB",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18784.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-18784",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513396,
  "published_at": "2026-08-04T16:30:09.771+00:00"
}