Vulnerabilities in pkg:npm/@nevware21/ts-utils

PACKAGE
Advisory Identifier: GHSA-x7j8-49r8-mr43
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Advisory Summary

CVE-2026-46681 is a HIGH prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting @nevware21/ts-utils libraries in the npm ecosystem. The issue involves prototype pollution in objdeepcopy/objcopyprops via for...in without hasownproperty. Remediation is available by upgrading affected packages to version 0.14.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/@nevware21/ts-utils

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/@nevware21/ts-utils. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-x7j8-49r8-mr43 CVE-2026-46681 HIGH @nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty

CVE-2026-46681 at a Glance

CVE Identifier CVE-2026-46681
GHSA Identifier GHSA-x7j8-49r8-mr43
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product @nevware21/ts-utils
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-46681

To remediate this vulnerability, upgrade all affected @nevware21/ts-utils dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@nevware21/ts-utils fixed: 0.14.0 
npm install @nevware21/ts-utils@0.14.0
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 @nevware21/ts-utils

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-46681, inspect your project dependencies using npm:

npm ls @nevware21/ts-utils

Analyze the terminal output to locate any version of @nevware21/ts-utils in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.14.0), your application is affected.

Note: The npm ls @nevware21/ts-utils 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 @nevware21/ts-utils, 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

## Summary The _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (__proto__, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application. ## Details In _copyProps() (copy.ts lines 186-191), the code iterates all enumerable properties including inherited ones and dangerous keys like __proto__. Any object with a __proto__ key (e.g., from untrusted JSON input) will overwrite the target's prototype. ## PoC ``` const malicious = JSON.parse('{"__proto__": {"polluted": true}}'); objDeepCopy(malicious); console.log({}.polluted); // true ``` ## Suggested Fix Add objHasOwnProperty check and filter __proto__, constructor, prototype keys.

CVE-2026-46681 Affected @nevware21/ts-utils Versions

1 component(s)
Fixed Versions:
0.14.0
Product / Package Ecosystem Affected Versions Fixed Version
@nevware21/ts-utils
npm/@nevware21/ts-utils
npm
< 0.14.0
0.14.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/nevware21/ts-utils/security/advisories/GHSA-x7j8-49r8-mr43
@nevware21/ts-utils Source Repository REPOSITORY
https://github.com/nevware21/ts-utils

Frequently Asked Questions

What is CVE-2026-46681?
CVE-2026-46681 is a security vulnerability in @nevware21/ts-utils involving Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which @nevware21/ts-utils versions are affected?
Affected versions include releases prior to 0.14.0 across affected packages: @nevware21/ts-utils.
What version fixes CVE-2026-46681?
Upgrading to 0.14.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @nevware21/ts-utils affected?
Yes, @nevware21/ts-utils is affected in releases prior to 0.14.0. Upgrade your dependency to 0.14.0 or later.
What CWE is associated with CVE-2026-46681?
CVE-2026-46681 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 CVE-2026-46681?
Run the dependency tree command: 'npm ls @nevware21/ts-utils'. 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-x7j8-49r8-mr43",
  "modified" : "2026-05-21T21:41:36Z",
  "published" : "2026-05-21T21:41:36Z",
  "aliases" : [ "CVE-2026-46681" ],
  "summary" : "@nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty",
  "details" : "## Summary\n\nThe _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (__proto__, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application.\n\n## Details\n\nIn _copyProps() (copy.ts lines 186-191), the code iterates all enumerable properties including inherited ones and dangerous keys like __proto__. Any object with a __proto__ key (e.g., from untrusted JSON input) will overwrite the target's prototype.\n\n## PoC\n```\nconst malicious = JSON.parse('{\"__proto__\": {\"polluted\": true}}');\nobjDeepCopy(malicious);\nconsole.log({}.polluted); // true\n```\n## Suggested Fix\n\nAdd objHasOwnProperty check and filter __proto__, constructor, prototype keys.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@nevware21/ts-utils"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.14.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.13.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/nevware21/ts-utils/security/advisories/GHSA-x7j8-49r8-mr43"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nevware21/ts-utils"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-21T21:41:36Z",
    "nvd_published_at" : null
  }
}