CVE-2021-39227

Name: CVE-2021-39227
Creator: NVD / NIST
Published: 2021-09-17T14:15:08.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2021-39227 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. ZRender is a lightweight graphic library providing 2d draw for Apache ECharts. In versions prior to 5.2.1, using `merge` and `clone` helper methods in the `src/core/util.ts` module results in prototype pollution. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

Description

ZRender is a lightweight graphic library providing 2d draw for Apache ECharts. In versions prior to 5.2.1, using `merge` and `clone` helper methods in the `src/core/util.ts` module results in prototype pollution. It affects the popular data visualization library Apache ECharts, which uses and exports these two methods directly. The GitHub Security Advisory page for this vulnerability contains a proof of concept. This issue is patched in ZRender version 5.2.1. One workaround is available: Check if there is `__proto__` in the object keys. Omit it before using it as an parameter in these affected methods. Or in `echarts.util.merge` and `setOption` if project is using ECharts.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.35%

67.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Baidu	Zrender	< 5.2.1

References

https://github.com/ecomfe/zrender/pull/826Patch, Third Party Advisory
https://github.com/ecomfe/zrender/releases/tag/5.2.1Release Notes, Third Party Advisory
https://github.com/ecomfe/zrender/security/advisories/GHSA-fhv8-fx5f-7fxfThird Party Advisory
https://github.com/ecomfe/zrender/pull/826Patch, Third Party Advisory
https://github.com/ecomfe/zrender/releases/tag/5.2.1Release Notes, Third Party Advisory
https://github.com/ecomfe/zrender/security/advisories/GHSA-fhv8-fx5f-7fxfThird Party Advisory

Timeline

Published: Sep 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39227?

How severe is CVE-2021-39227?

CVE-2021-39227 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39227?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39227?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST