Vulnerabilities in pkg:npm/immer

PACKAGE
Advisory Identifier: GHSA-9qmh-276g-x5pj
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Advisory Summary

CVE-2020-28477 is a HIGH (CVSS 7.5) prototype pollution vulnerability (CWE-471: Modification of Assumed-Immutable Data (MAID)) affecting Immer libraries in the npm ecosystem. The issue involves prototype pollution in immer. Remediation is available by upgrading affected packages to version 8.0.1.

3 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/immer

3 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/immer. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-9qmh-276g-x5pj CVE-2020-28477 HIGH Prototype Pollution in immer
GHSA-33f9-j839-rf8h CVE-2021-23436 CRITICAL Prototype Pollution in immer
GHSA-c36v-fmgq-m8hx CVE-2021-3757 HIGH Prototype Pollution in immer

CVE-2020-28477 at a Glance

CVE Identifier CVE-2020-28477
GHSA Identifier GHSA-9qmh-276g-x5pj
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-471: Modification of Assumed-Immutable Data (MAID)
Affected Product Immer
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-28477

To remediate this vulnerability, upgrade all affected Immer dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

immer fixed: 8.0.1 
npm install immer@8.0.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls immer

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-28477, inspect your project dependencies using npm:

npm ls immer

Analyze the terminal output to locate any version of Immer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.0.1), your application is affected.

Note: The npm ls immer command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-471: Modification of Assumed-Immutable Data (MAID), where the product does not properly protect an assumed-immutable element from being modified by an attacker. In Immer, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Overview Affected versions of immer are vulnerable to Prototype Pollution. ## Proof of exploit ```js 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](https://github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5) for this vulnerability, updating is recommended.

CVE-2020-28477 Affected Immer Versions

1 component(s)
Fixed Versions:
8.0.1
Product / Package Ecosystem Affected Versions Fixed Version
immer
npm/immer
npm
≥ 7.0.0
< 8.0.1
8.0.1

References

NVD — CVE-2020-28477 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-28477
Immer Source Repository REPOSITORY
https://github.com/immerjs/immer/issues/738
Security Fix Commit FIX COMMIT
https://github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5
Immer Source Repository REPOSITORY
https://github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213
snyk.io/vuln/snyk-java-orgw... WEB
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986
snyk.io/vuln/snyk-js-immer-... WEB
https://snyk.io/vuln/SNYK-JS-IMMER-1019369
www.npmjs.com/package/immer WEB
https://www.npmjs.com/package/immer

Frequently Asked Questions

What is CVE-2020-28477?
CVE-2020-28477 is a security vulnerability in Immer involving Prototype Pollution in immer under CWE-471: Modification of Assumed-Immutable Data (MAID).
Which Immer versions are affected?
Affected versions include releases prior to 8.0.1 across affected packages: immer.
What version fixes CVE-2020-28477?
Upgrading to 8.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is immer affected?
Yes, immer is affected in releases prior to 8.0.1. Upgrade your dependency to 8.0.1 or later.
What is the CVSS score of CVE-2020-28477?
CVE-2020-28477 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-28477?
CVE-2020-28477 is classified under CWE-471: Modification of Assumed-Immutable Data (MAID) (The product does not properly protect an assumed-immutable element from being modified by an attacker.).
How can I check npm dependencies for CVE-2020-28477?
Run the dependency tree command: 'npm ls immer'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9qmh-276g-x5pj",
  "modified" : "2024-04-25T22:17:51Z",
  "published" : "2021-01-20T21:27:56Z",
  "aliases" : [ "CVE-2020-28477" ],
  "summary" : "Prototype Pollution in immer",
  "details" : "## Overview\n\nAffected versions of immer are vulnerable to Prototype Pollution.\n\n## Proof of exploit\n\n```js\nconst {applyPatches, enablePatches} = require(\"immer\");\nenablePatches();\nlet obj = {};\nconsole.log(\"Before : \" + obj.polluted);\napplyPatches({}, [ { op: 'add', path: [ \"__proto__\", \"polluted\" ], value: \"yes\" } ]);\n// applyPatches({}, [ { op: 'replace', path: [ \"__proto__\", \"polluted\" ], value: \"yes\" } ]);\nconsole.log(\"After : \" + obj.polluted);\n```\n\n## Remediation\n\nVersion 8.0.1 contains a [fix](https://github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5) for this vulnerability, updating is recommended.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "immer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "8.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-28477"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/immerjs/immer/issues/738"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-IMMER-1019369"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/immer"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-471" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-01-20T19:37:58Z",
    "nvd_published_at" : "2021-01-19T11:15:00Z"
  }
}