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CVE-2026-44593

esm.sh is a no-build content delivery network (CDN) for web development

Published: 2026-05-28 · Last updated: 2026-06-02

Severity and scoring

CWE
CWE-22

Description

esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.

Source: NVD

References

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