CVE-2020-28461: Prototype Pollution

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-07-25 · updated 2026-06-17
Weakness: CWE-1321

Description

This affects the package js-ini before 1.3.0. If an attacker submits a malicious INI file to an application that parses it with parse , they will pollute the prototype on the application. This can be exploited further depending on the context.

Affected products

js-ini: before 1.3.0 — fixed in 1.3.0

How to fix

Upgrade to a fixed version: js-ini 1.3.0. Check the vendor advisory for mitigations.

References

https://github.com/Sdju/js-ini/commit/fa17efb7e3a7c9464508a254838d4c231784931e
https://security.snyk.io/vuln/SNYK-JS-JSINI-1048970
https://github.com/Sdju/js-ini/commit/fa17efb7e3a7c9464508a254838d4c231784931e
https://security.snyk.io/vuln/SNYK-JS-JSINI-1048970

Get alerted when CVE-2020-28461 or the next vulnerability affects your stack