7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-57318

CVE-2025-57318: csvjson vulnerable to prototype injection

A Prototype Pollution vulnerability in the toCsv function of csvjson versions thru 5.1.0 allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-57318

CVE-2025-57318:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
csvjson	npm	<= 5.1.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a prototype pollution issue in the csvjson library, specifically within the toCsv functionality. The analysis of the source code of version 5.1.0, which is known to be vulnerable, reveals that the toCSV function in src/app.js is the main entry point for the vulnerable operation. This function takes a JSON object as input and converts it into a CSV string. The core of the conversion logic is handled by the helper.toCsv function, which recursively processes the JSON object. During this recursive processing, the keys of the JSON object are used to construct the CSV structure. The vulnerability lies in the fact that there is no validation or sanitization of these keys, which allows an attacker to use keys like __proto__ to pollute the Object.prototype. Since no patched version is available, the toCSV function in the latest vulnerable version is identified as the vulnerable function. An exploit would involve calling this function with a malicious JSON payload, which would then trigger the prototype pollution.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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