CVE-2022-21803: Prototype Pollution

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-04-12 · updated 2026-06-17
Weakness: CWE-1321

Description

This affects the package nconf before 0.11.4. When using the memory engine, it is possible to store a nested JSON representation of the configuration. The .set() function, that is responsible for setting the configuration properties, is vulnerable to Prototype Pollution. By providing a crafted property, it is possible to modify the properties on the Object.prototype.

Affected products

nconf: before 0.11.4 — fixed in 0.11.4

How to fix

Upgrade to a fixed version: nconf 0.11.4. Check the vendor advisory for mitigations.

References

https://github.com/indexzero/nconf/pull/397
https://github.com/indexzero/nconf/releases/tag/v0.11.4
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2632450
https://snyk.io/vuln/SNYK-JS-NCONF-2395478
https://github.com/indexzero/nconf/pull/397
https://github.com/indexzero/nconf/releases/tag/v0.11.4
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2632450
https://snyk.io/vuln/SNYK-JS-NCONF-2395478

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