CVE-2026-46681 @nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty
Prototype pollution in @nevware21/ts-utils allows attackers to modify object prototypes, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46681?
CVE-2026-46681 is a high-severity vulnerability in nevware21 ts-utils, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
@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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-46681?
2 open source packages ship an affected version, including @nevware21/ts-utils.
| Package | Affected | Fixed in |
|---|---|---|
@nevware21/ts-utils npm | All versions | 0.14.0 |
@nevware21/ts-utils npm | All versions | 0.14.0 |
How do I fix CVE-2026-46681?
Upgrade @nevware21/ts-utils to 0.14.0 or later.
Is CVE-2026-46681 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46681 exists.
Sources
Also known as GHSA-x7j8-49r8-mr43, ROOT-APP-NPM-CVE-2026-46681.