CVE-2026-118249 json
Highcharts: series column construction writes to Object.prototype
published 12d ago modified 11d ago also EUVD-2026-112363 , GHSA-gfvx-2c2g-38wq
- cvss
- 7.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
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.
Patch / fix
- npm highcharts 13.1.0
- highcharts highcharts 13.1.0
Is CVE-2026-118249 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11d ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | 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 |
| CNA | 4.0 | 7.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | highcharts | >=13.0.0, <13.1.0 |
13.1.0 |
Affected products
- highcharts highcharts
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
-
github.com
/highcharts/highcharts/pull/25321
web
-
github.com
/highcharts/highcharts/commit/d3357705c8f348904441327e32f50ab528c3a205
web
-
github.com
/highcharts/highcharts/security/advisories/GHSA-gfvx-2c2g-38wq
web
-
github.com
/highcharts/highcharts/releases/tag/v13.1.0
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-118249
advisory
-
github.com
/highcharts/highcharts
package
Sources
- CVE List CVE-2026-118249
- GitHub Advisory GHSA-gfvx-2c2g-38wq
- NVD CVE-2026-118249
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.