Unauthorized File Access Affecting npm package, versions <6.13.3



    Attack Complexity High
    User Interaction Required

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.19% (56th percentile)
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6.5 medium
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7.7 high
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Red Hat
4.8 medium

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  • Snyk ID SNYK-JS-NPM-537604
  • published 12 Dec 2019
  • disclosed 11 Dec 2019
  • credit Daniel Ruf

How to fix?

Upgrade npm to version 6.13.3 or higher.


npm is a package manager for JavaScript.

Affected versions of this package are vulnerable to Unauthorized File Access. It is possible for packages to create symlinks to files outside of thenode_modules folder through the bin field upon installation.

For npm, 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. This behaviour is possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.