Prototype Pollution in Nevware21 Ts-Utils

CVE-2026-46681

@nevware21/ts-utils is a comprehensive TypeScript/JavaScript utility library. Prior to version 0.14.0, 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. Version 0.14.0 patches the issue.

Vulnerability class: Prototype Pollution

EPSS: 0.005 (39.6th percentile) — read the EPSS interpretation.