CVE-2026-118250
Description
A flaw was found in Highcharts. An attacker who controls chart series keys and data points can cause prototype pollution (unauthorized modification of base JavaScript objects) by providing dot-separated property paths. When the chart is rendered, the injected properties become accessible to all JavaScript running on the page without requiring any additional user interaction. This can disrupt application logic, corrupt data, or result in a denial of service.
Statement
Red Hat Product Security rates this vulnerability as Moderate because exploitation requires an attacker to supply maliciously crafted charting configurations to a web application, and the resulting prototype pollution is confined to the client-side browser runtime. In typical deployments, client-side graphing components do not expose backend services to direct compromise or privilege escalation. An attacker must have the ability to influence key paths and coordinate chart data points, and any secondary consequences depend entirely on how other frontend scripts interact with the modified object prototype.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
An attacker could modify sensitive data or program variables.
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
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