CVE-2025-3197

High severity, CVSS 7.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Versions of the package expand-object from 0.0.0 are vulnerable to Prototype Pollution in the expand() function in index.js. This function expands the given string into an object and allows a nested property to be set without checking the provided keys for sensitive properties like __proto__.

Published 2025-04-04. Last modified 2026-06-17.