VULNERABILITY INTELLIGENCE
CVE-2026-44593
EPSS probability0.44%
CISA KEVNot currently listed
Published2026-05-28
Last modified2026-10-26
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.
Weakness classification
- security-advisories@github.com: CWE-22