CVE-2026-35454
Received Received - Intake
Zip Slip Vulnerability in Code Extension Marketplace Allows Arbitrary File Write

Publication date: 2026-04-06

Last updated on: 2026-04-28

Assigner: GitHub, Inc.

Description
The Code Extension Marketplace is an open-source alternative to the VS Code Marketplace. Prior to 2.4.2, Zip Slip vulnerability in coder/code-marketplace allowed a malicious VSIX file to write arbitrary files outside the extension directory. ExtractZip passed raw zip entry names to a callback that wrote files via filepath.Join with no boundary check; filepath.Join resolved .. components but did not prevent the result from escaping the base path. This vulnerability is fixed in 2.4.2.
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Meta Information
Published
2026-04-06
Last Modified
2026-04-28
Generated
2026-06-16
AI Q&A
2026-04-07
EPSS Evaluated
2026-06-15
NVD
CVE-2026-35454
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
coder code-marketplace to 2.4.1 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

This vulnerability, known as a Zip Slip, exists in the Code Extension Marketplace before version 2.4.2. It allows a malicious VSIX file to write arbitrary files outside the intended extension directory. The issue arises because the ExtractZip function passes raw zip entry names to a callback that writes files using filepath.Join without checking boundaries. Although filepath.Join resolves '..' components, it does not prevent the resulting path from escaping the base directory, enabling potential directory traversal and unauthorized file writes.

Impact Analysis

This vulnerability can allow an attacker to write files anywhere on the file system where the application has write permissions. This could lead to overwriting critical files, injecting malicious code, or compromising the integrity and security of the system running the Code Extension Marketplace.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Code Extension Marketplace to version 2.4.2 or later, where the Zip Slip vulnerability has been fixed.

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