CVE-2020-7788: Prototype Pollution

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-12-11 · updated 2026-10-08
Weakness: CWE-1321

Description

This affects the package ini before 1.3.6. 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.

Affected products

Debian Linux: 9.0
Ini Project Ini: before 1.3.6 — fixed in 1.3.6
Npm Ini: before 1.3.6 — fixed in 1.3.6

How to fix

Upgrade to a fixed version: Ini Project Ini 1.3.6; Npm Ini 1.3.6. Check the vendor advisory for mitigations.

References

https://github.com/npm/ini/commit/56d2805e07ccd94e2ba0984ac9240ff02d44b6f1
https://lists.debian.org/debian-lts-announce/2020/12/msg00032.html
https://snyk.io/vuln/SNYK-JS-INI-1048974
https://github.com/npm/ini/commit/56d2805e07ccd94e2ba0984ac9240ff02d44b6f1
https://lists.debian.org/debian-lts-announce/2020/12/msg00032.html
https://snyk.io/vuln/SNYK-JS-INI-1048974

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