{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "13.0.0"
                  },
                  {
                    "fixed": "13.1.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "d3357705c8f348904441327e32f50ab528c3a205"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v13.1.0",
                "range": [
                  {
                    "fixed": "5d3e905ce2e2c75c174c06cf8dee0f00a5e02841"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "e44b0e19db9affdb85b667524365d268c314b957"
            },
            {
              "fixed": "5d3e905ce2e2c75c174c06cf8dee0f00a5e02841"
            },
            {
              "fixed": "d3357705c8f348904441327e32f50ab528c3a205"
            }
          ],
          "repo": "https://github.com/highcharts/highcharts",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-gfvx-2c2g-38wq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118249.json"
  },
  "details": "Highcharts JS is a JavaScript charting library based on SVG. From 13.0.0 until 13.1.0, Highcharts builds series data columns by using point option keys directly as column IDs. Own enumerable __proto__ and constructor keys from parsed point objects can therefore direct integer-indexed writes to Object.prototype or the Object constructor. The inherited values affect reads and for-in enumeration across the page and can disrupt rendering or alter consuming application behavior without user interaction beyond rendering the chart. This issue is fixed in 13.1.0.",
  "id": "CVE-2026-118249",
  "modified": "2026-10-30T10:30:44.898708317Z",
  "published": "2026-10-28T17:57:18.323Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/releases/tag/v13.1.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118249.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118249"
    },
    {
      "type": "FIX",
      "url": "https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205"
    },
    {
      "type": "FIX",
      "url": "https://github.com/highcharts/highcharts/pull/25321"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Highcharts: series column construction writes to Object.prototype"
}