{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.3.0"
              },
              {
                "last_affected": "1.3.17"
              },
              {
                "introduced": "1.4.0"
              },
              {
                "last_affected": "1.4.16"
              },
              {
                "introduced": "1.5.0"
              },
              {
                "last_affected": "1.5.4"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "41f4deef34a9d0f94fcb830e2c831a9eb6236ade"
            },
            {
              "introduced": "84347820c8550b5750f2cd581c14ab201611c579"
            },
            {
              "last_affected": "f63e2a819aff6e468242dc2e54ccbd5b75d63654"
            },
            {
              "introduced": "b90fbfac5ef484089447bf5e3fe6ad7baaaebada"
            },
            {
              "last_affected": "dfd44a234645ed29cc6d190048bc8ae80c5454cd"
            }
          ],
          "repo": "https://github.com/open62541/open62541",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "icscert",
    "cwe_ids": [
      "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65423.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "master"
          },
          {
            "last_affected": "master"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "An integer overflow in the UA_Variant arrayDimensions product \ncomputation in open62541 may allow a remote attacker to trigger an \nout-of-bounds write.",
  "id": "CVE-2026-65423",
  "modified": "2026-08-01T03:32:53.360691906Z",
  "published": "2026-07-30T21:59:06.093Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df"
    },
    {
      "type": "WEB",
      "url": "https://www.o6-automation.com/contact"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65423.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65423"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "o6 Automation open62541 Integer Overflow or Wraparound"
}