Arbitrary File Write via Archive Extraction (Zip Slip) Affecting jszip package, versions <2.7.0 >=3.0.0 <3.8.0



    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    EPSS 0.95% (83rd percentile)
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7.3 high
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Red Hat
7.3 high

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  • Snyk ID SNYK-JS-JSZIP-3188562
  • published 4 Jan 2023
  • disclosed 4 Jan 2023
  • credit McCaulay Hudson

How to fix?

Upgrade jszip to version 2.7.0, 3.8.0 or higher.


jszip is a Create, read and edit .zip files with JavaScript

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) due to improper sanitization of filenames when files are loaded with the loadAsync method.


It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:

+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys