Vulnerability-Lookup

CVE-2026-118249 (GCVE-0-2026-118249)

Vulnerability from cvelistv5 – Published: 2026-10-28 17:57 – Updated: 2026-10-29 20:55

Title

Highcharts: series column construction writes to Object.prototype

Summary

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.

Severity

7.2 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-29 15:28 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8035 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/highcharts/highcharts/security…	x_refsource_CONFIRM
https://github.com/highcharts/highcharts/pull/25321	x_refsource_MISC
https://github.com/highcharts/highcharts/commit/d…	x_refsource_MISC
https://github.com/highcharts/highcharts/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
highcharts	highcharts	Affected: >= 13.0.0, < 13.1.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-118249

Vulnerability from fkie_nvd - Published: 2026-10-28 18:17 - Updated: 2026-10-29 21:17

Severity

7.2 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205
	security-advisories@github.com	https://github.com/highcharts/highcharts/pull/25321
	security-advisories@github.com	https://github.com/highcharts/highcharts/releases/tag/v13.1.0
	security-advisories@github.com	https://github.com/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-GFVX-2C2G-38WQ

Vulnerability from github – Published: 2026-10-28 19:56 – Updated: 2026-10-28 19:56

Summary

Highcharts: series column construction writes to Object.prototype

Details

Impact

When series columns are built from point objects, the point option keys are used directly as data column ids, so the write that populates a column reaches Object.prototype and the Object constructor. Keys named __proto__ and constructor survive JSON.parse as own enumerable properties, so an attacker who controls the point objects can set integer-keyed properties on Object.prototype, one per point index, to values of their choosing. Named properties cannot be reached this way. The integer keys still affect every object in the page: reading an out-of-range index on any array or plain object returns the attacker's value, and for...in over any object yields the injected keys, so unrelated code can take branches it should not using attacker-supplied data, and rendering can fail as a side effect. The properties remain in place once the chart has been built, and no user interaction is required beyond rendering the chart.

Consequences beyond disruption depend on the consuming application.

Workarounds

Drop-in fix - for any versions affected (6.1.0-13.0.2). Add the below IIFE to run after Highcharts is loaded.

;!function(t){if(t&&t.Point&&!t.Point.prototype.protoPollutionPatched){var o=t.Point.prototype,r=o.optionsToObject,e=o.setNestedProperty,n=Object.prototype.hasOwnProperty;o.optionsToObject=function(t){if(t&&"object"==typeof t&&!Array.isArray(t)&&(n.call(t,"__proto__")||n.call(t,"constructor"))){var o={};for(var e in t)n.call(t,e)&&!c(e)&&(o[e]=t[e]);t=o}return r.call(this,t)},o.setNestedProperty=function(t,o,r){return String(r).split(".").some(c)?t:e.call(this,t,o,r)},o.protoPollutionPatched=!0}function c(t){return"__proto__"===t||"constructor"===t}}(Highcharts);

Live demo & testing

Obtaining the patched version

The patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example npm install highcharts@13.1.0. If you load Highcharts from the CDN, use the versioned URLs on code.highcharts.com, for example https://code.highcharts.com/13.1.0/highcharts.js. For more on each installation method, see the installation guide.

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:L/SI:L/SA:L

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 13.0.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "highcharts"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "13.0.0"
            },
            {
              "fixed": "13.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-118249"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-28T19:56:13Z",
    "nvd_published_at": "2026-10-28T18:17:16Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nWhen series columns are built from point objects, the point option keys are used directly as data column ids, so the write that populates a column reaches `Object.prototype` and the `Object` constructor. Keys named `__proto__` and `constructor` survive `JSON.parse` as own enumerable properties, so an attacker who controls the point objects can set integer-keyed properties on `Object.prototype`, one per point index, to values of their choosing. Named properties cannot be reached this way. The integer keys still affect every object in the page: reading an out-of-range index on any array or plain object returns the attacker\u0027s value, and `for...in` over any object yields the injected keys, so unrelated code can take branches it should not using attacker-supplied data, and rendering can fail as a side effect. The properties remain in place once the chart has been built, and no user interaction is required beyond rendering the chart.\n\nConsequences beyond disruption depend on the consuming application.\n\n### Workarounds\nDrop-in fix - for any versions affected (6.1.0-13.0.2).\nAdd the below IIFE to run after Highcharts is loaded.\n\n```javascript\n;!function(t){if(t\u0026\u0026t.Point\u0026\u0026!t.Point.prototype.protoPollutionPatched){var o=t.Point.prototype,r=o.optionsToObject,e=o.setNestedProperty,n=Object.prototype.hasOwnProperty;o.optionsToObject=function(t){if(t\u0026\u0026\"object\"==typeof t\u0026\u0026!Array.isArray(t)\u0026\u0026(n.call(t,\"__proto__\")||n.call(t,\"constructor\"))){var o={};for(var e in t)n.call(t,e)\u0026\u0026!c(e)\u0026\u0026(o[e]=t[e]);t=o}return r.call(this,t)},o.setNestedProperty=function(t,o,r){return String(r).split(\".\").some(c)?t:e.call(this,t,o,r)},o.protoPollutionPatched=!0}function c(t){return\"__proto__\"===t||\"constructor\"===t}}(Highcharts);\n```\n\n[Live demo \u0026 testing](https://jsfiddle.net/BlackLabel/nopc6vhj/)\n\n### Obtaining the patched version\nThe patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example `npm install highcharts@13.1.0`. If you load Highcharts from the CDN, use the versioned URLs on code.highcharts.com, for example `https://code.highcharts.com/13.1.0/highcharts.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/getting-started/installation).",
  "id": "GHSA-gfvx-2c2g-38wq",
  "modified": "2026-10-28T19:56:13Z",
  "published": "2026-10-28T19:56:13Z",
  "references": [
    {
      "type": "WEB",
      "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": "WEB",
      "url": "https://github.com/highcharts/highcharts/pull/25321"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/highcharts/highcharts"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/releases/tag/v13.1.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Highcharts: series column construction writes to Object.prototype"
}

Sightings

Author	Source	Type	Date	Other

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-118249 (GCVE-0-2026-118249)

FKIE_CVE-2026-118249

GHSA-GFVX-2C2G-38WQ

Impact

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Obtaining the patched version

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