open62541 — security advisory

{
  "id": "2f2a7668505743f48ea8c7a8fb176fefcb3eeae73669b5d9efe5c587176f62d3",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18784",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-18784",
    "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:UBUNTU-CVE-2026-18784",
    "products": [
      {
        "name": {
          "value": "open62541",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.4.11.1-1build1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.18-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "open62541",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.4.11.1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.11.1-1build1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-18784",
      "aliases": [
        "UBUNTU-CVE-2026-18784"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
        },
        {
          "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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "open62541",
            "purl": "pkg:deb/ubuntu/open62541?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1.4.11.1-1build1",
            "1.4.18-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18784.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libopen62541-1.4",
                "binary_version": "1.4.18-1"
              },
              {
                "binary_name": "libopen62541-1.4-tools",
                "binary_version": "1.4.18-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "open62541",
            "purl": "pkg:deb/ubuntu/open62541?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1.4.11.1-1",
            "1.4.11.1-1build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18784.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libopen62541-1.4",
                "binary_version": "1.4.11.1-1build1"
              },
              {
                "binary_name": "libopen62541-1.4-tools",
                "binary_version": "1.4.11.1-1build1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:59:53.788517118Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-18784"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-18784",
        "https://www.cve.org/CVERecord?id=CVE-2026-18784",
        "https://github.com/open62541/open62541/issues/8139",
        "https://github.com/gff-cw/information/issues/11",
        "https://vuldb.com/cve/CVE-2026-18784",
        "https://vuldb.com/submit/857012",
        "https://vuldb.com/vuln/385786",
        "https://vuldb.com/vuln/385786/cti"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-18784",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 359893,
  "published_at": "2026-08-04T17:16:00+00:00"
}