Arbitrary File Overwrite
Versions of the npm CLI prior to 6.13.4 are vulnerable to an Arbitrary File Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a
serve binary, any subsequent installs of packages that also create a
serve binary would overwrite the previous
This behavior is still allowed in local installations and also through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.
Thank you to Daniel Ruf for reporting the issue!
Further information: npm blog post