Dependencies & Supply Chain
high Severity
Free Check

Prototype Pollution Indicators

Analyzes client-side object manipulation utilities for prototype pollution vulnerabilities (Object.prototype.__proto__).

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Why It Matters

Prototype pollution allows attackers to alter JavaScript default object behaviors, leading to denial of service or remote code execution.

How We Check This

We analyze recursive merge and query parameter parsers for unsafe __proto__ or constructor.prototype assignments.

How to Fix & Implement

Copy-paste configuration blocks tailored for your web server or edge proxy.

nginx snippet
Update Lodash, jQuery, and query-string packages to patched versions

Frequently Asked Questions

What is prototype pollution?

Injecting properties into the root JavaScript Object.prototype, which causes all objects in the runtime to inherit the malicious property.