CVE-2020-7746: Prototype Pollution

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-10-29 · updated 2026-06-17
Weakness: CWE-1321

Description

This affects the package chart.js before 2.9.4. The options parameter is not properly sanitized when it is processed. When the options are processed, the existing options (or the defaults options) are deeply merged with provided options. However, during this operation, the keys of the object being set are not checked, leading to a prototype pollution.

Affected products

chart.js: before 2.9.4 — fixed in 2.9.4

How to fix

Upgrade to a fixed version: chart.js 2.9.4. Check the vendor advisory for mitigations.

References

https://github.com/chartjs/Chart.js/pull/7920
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1019375
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBCHARTJS-1019376
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019374
https://snyk.io/vuln/SNYK-JS-CHARTJS-1018716
https://github.com/chartjs/Chart.js/pull/7920
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1019375
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBCHARTJS-1019376
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019374
https://snyk.io/vuln/SNYK-JS-CHARTJS-1018716

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