What’s Vulnerable › Vulnerabilities

CVE-2020-28477: Prototype Pollution

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-19 · updated 2026-06-17

Description

This affects all versions of package immer.

Affected products

• immer: before 8.0.1 — fixed in 8.0.1

How to fix

Upgrade to a fixed version: immer 8.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986
• https://snyk.io/vuln/SNYK-JS-IMMER-1019369
• https://github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986
• https://snyk.io/vuln/SNYK-JS-IMMER-1019369

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