Security advisory

{
  "id": "6343d4ed17b315a2371482d4df7fe23536b7c9d7bc5f154c713cfc27b5e01d79",
  "url": "https://osv.dev/vulnerability/CVE-2023-26150",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-26150",
    "summary": "Versions of the package asyncua before 0.9.96 are vulnerable to Improper Authentication such that it is possible to access Address Space without encryption and authentication. **Note:** This issue is a result of missing checks for services that require an active session.",
    "evidence": "osv:CVE-2023-26150",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-26150",
      "aliases": [
        "CVE-2023-26150",
        "GHSA-2894-qcqf-g23g",
        "PYSEC-2023-189"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/freeopcua/opcua-asyncio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c55447d865a6f9b9505bc538f3c56cf3a1421c60"
                },
                {
                  "fixed": "2be7ce80df05de8d6c6ae1ebce6fa2bb7147844a"
                },
                {
                  "fixed": "b4106dfd5037423c9d1810b48a97296b59cde513"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:freeopcua:opcua-asyncio:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.96"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2be7ce80df05de8d6c6ae1ebce6fa2bb7147844a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b4106dfd5037423c9d1810b48a97296b59cde513"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c55447d865a6f9b9505bc538f3c56cf3a1421c60"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.9.96"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.9.95",
            "v0.9.94",
            "v0.9.93",
            "v0.9.92",
            "v0.9.91",
            "v0.9.90",
            "0.9.14",
            "v0.9.12",
            "v0.9.11",
            "v0.9.10",
            "v0.9.8",
            "0.9.7",
            "0.9.6",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.1",
            "0.9.0",
            "0.8.4",
            "0.8.3",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.6.1",
            "0.6.0",
            "0.5.1",
            "0.90.4",
            "0.90.3",
            "0.90.2",
            "0.90.1",
            "0.90.0",
            "0.10.17",
            "0.10.15",
            "0.10.14",
            "0.10.12",
            "0.10.11",
            "0.10.9",
            "0.10.8",
            "0.10.7",
            "0.10.6",
            "0.10.5",
            "0.10.4",
            "0.10.3",
            "0.10.2",
            "0.10.1",
            "0.10.0",
            "0.10",
            "0.9.19",
            "0.9.18",
            "0.9.17",
            "v0.9.13",
            "0.9.13"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-26150.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.479242116Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/artfire52/84f7279a4119d6f90381ac49d7121121",
        "https://github.com/FreeOpcUa/opcua-asyncio/releases/tag/v0.9.96",
        "https://security.snyk.io/vuln/SNYK-PYTHON-ASYNCUA-5673435",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26150.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-26150",
        "https://github.com/FreeOpcUa/opcua-asyncio/issues/1014",
        "https://github.com/FreeOpcUa/opcua-asyncio/commit/2be7ce80df05de8d6c6ae1ebce6fa2bb7147844a",
        "https://github.com/FreeOpcUa/opcua-asyncio/commit/b4106dfd5037423c9d1810b48a97296b59cde513",
        "https://github.com/FreeOpcUa/opcua-asyncio/pull/1015"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "snyk",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26150.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-26150",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505599,
  "published_at": "2023-10-03T05:00:02.176+00:00"
}