---
id: CVE-2026-118249
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 poi…
severity: high
cvss: 7.2
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-1321
vendor: highcharts
product: highcharts
affected:
  - 'highcharts >= 13.0.0, < 13.1.0'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T15:28:32.137806Z'
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T20:55:21.954Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118249'
references:
  - url: >-
      https://github.com/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq
    label: >-
      https://github.com/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq
  - url: 'https://github.com/highcharts/highcharts/pull/25321'
    label: 'https://github.com/highcharts/highcharts/pull/25321'
  - url: >-
      https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205
    label: >-
      https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205
  - url: 'https://github.com/highcharts/highcharts/releases/tag/v13.1.0'
    label: 'https://github.com/highcharts/highcharts/releases/tag/v13.1.0'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-118249'
  - url: 'https://github.com/advisories/GHSA-gfvx-2c2g-38wq'
tags:
  - cve.org
  - ghsa
  - npm
epss: 0.00363
epssPercentile: 0.30147
aliases:
  - GHSA-gfvx-2c2g-38wq
ecosystem: npm
patched:
  - highcharts 13.1.0
ingestedAt: '2026-10-28T18:15:46.375Z'
---

## Overview

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.

## Affected

- `highcharts >= 13.0.0, < 13.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-118249)

Affected packages:

- `highcharts >= 13.0.0, <= 13.0.2`

Patched in:

- `highcharts 13.1.0`

Source: https://github.com/advisories/GHSA-gfvx-2c2g-38wq