Security advisory

{
  "id": "48f1cbeab87e3ad0948de60387fcd38664bbf6856860dbd07d3a953435f2cf25",
  "url": "https://osv.dev/vulnerability/CVE-2026-67856",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-67856",
    "summary": "An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service via crafted CreateSubscription, CreateMonitoredItems(Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions requests",
    "evidence": "osv:CVE-2026-67856",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-67856",
      "aliases": [
        "CVE-2026-67856"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open62541/open62541",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3bdeed5dfe8309cecabf36e04afe956b7f72ebd8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.5.5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.5.5",
            "v1.5.4",
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.5.0-rc2",
            "v1.5.0-rc1",
            "v1.2-rc1",
            "v1.1",
            "v1.1-rc1",
            "basic256sha256",
            "v1.1-dev",
            "v1.0-dev",
            "v1.0-rc3",
            "v0.2.0-RC1",
            "v0.1.0-RC4",
            "v0.1.0-RC1",
            "v0.0.0-150309",
            "v0.1-automation14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67856.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.277583962Z",
      "provider": "osv",
      "references": [
        "https://github.com/open62541/open62541/blob/master/examples/access_control/server_access_control.c",
        "https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c",
        "https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.c",
        "https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.h",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67856.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67856",
        "https://github.com/open62541/open62541/issues/8092"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67856.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67856",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518742,
  "published_at": "2026-08-04T00:00:00+00:00"
}