Nascent Political Miscreant
Severity: low

Symlink reference outside of node_modules



Versions of the npm CLI prior to 6.13.3 are vulnerable to a symlink reference outside of node_modules. It is possible for packages to create symlinks to files outside of thenode_modules folder through the bin field upon installation. A properly constructed entry in the package.json bin field would allow a package publisher to create a symlink pointing to arbitrary files on a user’s system when the package is installed. Only files accessible by the user running the npm install are affected.

This behavior is still possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.


Upgrade to version 6.13.3 or later.


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Advisory timeline

  1. published

    Advisory Published
    Dec 12th, 2019
  2. reported

    Reported by Daniel Ruf
    Dec 11th, 2019