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[ CVE-2026-118250 · Published 28 Oct 2026 ]

Highcharts: dotted series.keys paths write to Object.prototype

CVSS 7.2 EPSS <1%Fix available

[ Description ]Official description

Highcharts JS is a JavaScript charting library based on SVG. From 6.1.0 until 11.4.9, 12.6.1, and 3.1.0, Highcharts follows dot-separated series.keys paths without filtering each segment. An attacker who controls series.keys and matching point data can use a path through __proto__ to assign arbitrary named properties to Object.prototype. Those properties are visible to all JavaScript in the page, and no user interaction is required beyond rendering the chart. This issue is fixed in 11.4.9, 12.6.1, and 3.1.0.

[ Fixes ]Fixes and patches

  • highcharts 12.6.1Fixed version · GitHub Advisories · npm package highcharts: upgrade to 12.6.1 or later (affected >= 12.0.0, < 12.6.1)
  • highcharts 13.1.0Fixed version · GitHub Advisories · npm package highcharts: upgrade to 13.1.0 or later (affected >= 13.0.0, <= 13.0.2)
  • highcharts 11.4.9Fixed version · GitHub Advisories · npm package highcharts: upgrade to 11.4.9 or later (affected >= 6.1.0, < 11.4.9)

[ Packages ]Affected open-source packages

[ References ]References