Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-3636-h3vx-6465
FAQ
What is CVE-2026-44593?
CVE-2026-44593 is a documented vulnerability. 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 ultim...
How severe is CVE-2026-44593?
CVSS scoring is not yet available for CVE-2026-44593. Check NVD for updates.
Is there a patch for CVE-2026-44593?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.