yargs-parser Vulnerable to Prototype Pollution
Affected versions of yargs-parser are vulnerable to prototype pollution. Arguments are not properly sanitized, allowing an attacker to modify the prototype of Object, causing the addition or modification of an existing property that will exist on all objects.
Parsing the argument --foo.__proto__.bar baz' adds a bar property with value baz to all objects. This is only exploitable if attackers have control over the arguments being passed to yargs-parser.
Recommendation
Upgrade to versions 13.1.2, 15.0.1, 18.1.1 or later.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | yargs-parser | >= 6.0.0, < 13.1.2, >= 14.0.0, < 15.0.1, >= 16.0.0, < 18.1.1, < 5.0.1 | 13.1.2, 15.0.1, 18.1.1, 5.0.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-7608
- https://github.com/yargs/yargs-parser/commit/1c417bd0b42b09c475ee881e36d292af4fa2cc36
- https://github.com/yargs/yargs-parser/commit/63810ca1ae1a24b08293a4d971e70e058c7a41e2
- https://github.com/yargs/yargs-parser
- https://snyk.io/vuln/SNYK-JS-YARGSPARSER-560381
- https://www.npmjs.com/advisories/1500
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-1321, CWE-915- Platform
- npm
- Package
yargs-parser- Disclosed
- 04.09.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p9pc-299p-vxgp - CC BY 4.0
Vulnerability history: yargs-parser
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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