Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118249Highcharts: series column construction writes to Object.prototype
High 7.2
In plain English
A high-severity prototype pollution in highcharts from highcharts. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | highcharts | 13.1.0 | GHSA-gfvx-2c2g-38wq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| highcharts | highcharts | >= 13.0.0, < 13.1.0 |
Weakness: CWE-1321 · Vector: 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
References
- https://github.com/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq x_refsource_CONFIRM
- https://github.com/highcharts/highcharts/pull/25321 x_refsource_MISC
- https://github.com/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205 x_refsource_MISC
- https://github.com/highcharts/highcharts/releases/tag/v13.1.0 x_refsource_MISC