GHSA-h726-x36v-rx45: Lodash.merge Prototype Pollution Vulnerability

HIGH
Share
CWE-1321
Published
Advisory Summary

GHSA-h726-x36v-rx45 is a HIGH prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Lodash.merge libraries in the npm ecosystem. The issue involves prototype pollution in lodash.merge. Remediation is available by upgrading affected packages to version 4.6.2.

GHSA-h726-x36v-rx45 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-h726-x36v-rx45
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Lodash.merge
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-h726-x36v-rx45

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

lodash.merge fixed: 4.6.2 
npm install lodash.merge@4.6.2
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 lodash.merge

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-h726-x36v-rx45, inspect your project dependencies using npm:

npm ls lodash.merge

Analyze the terminal output to locate any version of Lodash.merge in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.6.2), your application is affected.

Note: The npm ls lodash.merge 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-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Lodash.merge, 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

Versions of `lodash.merge` before 4.6.2 are vulnerable to prototype pollution. The function `merge` may allow a malicious user to modify the prototype of `Object` via `{constructor: {prototype: {...}}}` causing the addition or modification of an existing property that will exist on all objects. ## Recommendation Update to version 4.6.2 or later.

GHSA-h726-x36v-rx45 Affected Lodash.merge Versions

1 component(s)
Fixed Versions:
4.6.2
Product / Package Ecosystem Affected Versions Fixed Version
lodash.merge
npm/lodash.merge
npm
< 4.6.2
4.6.2

References

www.npmjs.com/advisories/1066 WEB
https://www.npmjs.com/advisories/1066

Frequently Asked Questions

What is GHSA-h726-x36v-rx45?
GHSA-h726-x36v-rx45 is a security vulnerability in Lodash.merge involving Prototype Pollution in lodash.merge under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Lodash.merge versions are affected?
Affected versions include releases prior to 4.6.2 across affected packages: lodash.merge.
What version fixes GHSA-h726-x36v-rx45?
Upgrading to 4.6.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is lodash.merge affected?
Yes, lodash.merge is affected in releases prior to 4.6.2. Upgrade your dependency to 4.6.2 or later.
What CWE is associated with GHSA-h726-x36v-rx45?
GHSA-h726-x36v-rx45 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for GHSA-h726-x36v-rx45?
Run the dependency tree command: 'npm ls lodash.merge'. 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-h726-x36v-rx45",
  "modified" : "2020-08-31T18:46:04Z",
  "published" : "2020-09-03T18:04:54Z",
  "aliases" : [ ],
  "summary" : "Prototype Pollution in lodash.merge",
  "details" : "Versions of `lodash.merge` before 4.6.2 are vulnerable to prototype pollution. The function `merge` may allow a malicious user to modify the prototype of `Object` via `{constructor: {prototype: {...}}}` causing the addition or modification of an existing property that will exist on all objects.\n\n\n\n\n## Recommendation\n\nUpdate to version 4.6.2 or later.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "lodash.merge"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.6.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/1066"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-31T18:46:04Z",
    "nvd_published_at" : null
  }
}