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Current and expected behavior

Overview

A Prototype Pollution vulnerability Affecting chartist , versions >=1.0.0 <=1.3.0, due to missing check if the argument resolves to the object prototype. This allow the attacker to inject malicious object property using the built-in Object property __proto__ which recursively assigned to all the objects in the program.

Reproduction

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Chartist version

1.3.0

Possible solution

• Freeze the root prototype using Object.freeze
• Require schema validation of JSON input.
• Avoid using unsafe recursive merge functions.
• Consider using objects without prototypes (for example, Object.create(null)), breaking the prototype chain and preventing pollution.
• As a best practice use Map instead of Object