CVE-2025-3197: expand-object Vulnerable to Prototype Pollution via the expand() Function

April 4, 2025

Versions of the package expand-object from 0.0.0 to 0.4.2 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.

References

gist.github.com/miguelafmonteiro/d8f66af61d14e06338b688f90c4dfa7c
github.com/advisories/GHSA-4vjr-hfpp-2m7w
github.com/jonschlinkert/expand-object
github.com/jonschlinkert/expand-object/blob/master/index.js
nvd.nist.gov/vuln/detail/CVE-2025-3197
security.snyk.io/vuln/SNYK-JS-EXPANDOBJECT-5821390

Code Behaviors & Features

Detect and mitigate CVE-2025-3197 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →