---
id: CVE-2021-44906
title: >-
  Minimist <=1.2.5 is vulnerable to Prototype Pollution via file index.js,
  function setKey() (lines 69-95).
summary: >-
  Minimist <=1.2.5 is vulnerable to Prototype Pollution via file index.js,
  function setKey() (lines 69-95).
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-1321
vendor: substack
product: minimist
affected:
  - minimist < 1.2.6
patched:
  - minimist 1.2.6
published: '2022-03-17'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:17:42.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-44906'
references:
  - url: >-
      https://github.com/Marynk/JavaScript-vulnerability-detection/blob/main/minimist%20PoC.zip
    label: cve@mitre.org
  - url: 'https://github.com/substack/minimist/blob/master/index.js#L69'
    label: cve@mitre.org
  - url: 'https://github.com/substack/minimist/issues/164'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20240621-0006/'
    label: cve@mitre.org
  - url: 'https://snyk.io/vuln/SNYK-JS-MINIMIST-559764'
    label: cve@mitre.org
  - url: >-
      https://stackoverflow.com/questions/8588563/adding-custom-properties-to-a-function/20278068#20278068
    label: cve@mitre.org
  - url: >-
      https://github.com/Marynk/JavaScript-vulnerability-detection/blob/main/minimist%20PoC.zip
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/substack/minimist/blob/master/index.js#L69'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/substack/minimist/issues/164'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240621-0006/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://snyk.io/vuln/SNYK-JS-MINIMIST-559764'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://stackoverflow.com/questions/8588563/adding-custom-properties-to-a-function/20278068#20278068
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.04581
epssPercentile: 0.91383
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/nevermoe/CVE-2021-44906'
  checkedAt: '2026-10-08T22:12:30.003Z'
exploitAvailable: true
ingestedAt: '2026-10-08T22:11:53.748Z'
---

## Overview

Minimist <=1.2.5 is vulnerable to Prototype Pollution via file index.js, function setKey() (lines 69-95).

## Affected

- `minimist < 1.2.6`

## Remediation

Upgrade past the affected range:

- `minimist 1.2.6`