Quick answers
- Is CVE-2026-118249 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118249 being exploited in the wild.
- How severe is CVE-2026-118249?
- High severity, with a CVSS score of 4, published 28 October 2026.
- Which products and versions are affected?
- Highsoft Highcharts JS 13.0.0 to 13.0.x; highcharts (npm) >= 13.0.0, <= 13.0.2, SEMVER:introduced=13.0.0,fixed=13.1.0.
- Is there a fix for CVE-2026-118249?
- Yes. highcharts (npm): upgrade to 13.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118249 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118249?
- Check whether you run Highsoft Highcharts JS or highcharts (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- highcharts (npm): upgrade to 13.1.0 or later
npm install highcharts@13.1.0
Technical details
The vulnerability is a prototype pollution flaw where point option keys named `__proto__` or `constructor` are used directly as column IDs in series data construction, allowing writes to Object.prototype and the Object constructor through `columns[key][i] = value`. An attacker controlling point objects (e.g., via JSON.parse on untrusted data) can inject these keys to modify shared objects affecting the entire page. The fix filters out these unsafe keys during column building and point instantiation.
Affected products
- Highsoft Highcharts JS 13.0.0 to 13.0.x
Identifiers
- CVE-2026-118249
- GHSA-gfvx-2c2g-38wq
Timeline
- 2026-10-28: disclosed