CVE-2025-59342
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-17

Last updated on: 2025-09-18

Assigner: GitHub, Inc.

Description
esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories.
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Meta Information
Published
2025-09-17
Last Modified
2025-09-18
Generated
2026-06-16
AI Q&A
2025-09-17
EPSS Evaluated
2026-06-15
NVD
CVE-2025-59342
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
esm-dev esm.sh *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-24 The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory.
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Executive Summary

This vulnerability is a path-traversal flaw in esm.sh versions 136 and earlier. It occurs because the application uses the X-Zone-Id HTTP header value to build a filesystem path without properly validating or restricting it. An attacker can supply '../' sequences in this header to cause the application to write files outside its intended storage directory, potentially overwriting or creating files in arbitrary locations on the server.

Impact Analysis

This vulnerability can allow an attacker to write files to arbitrary directories on the server hosting esm.sh. This could lead to unauthorized file creation or modification, potentially compromising the integrity of the system, enabling further attacks, or causing data loss or service disruption.

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