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Vulnerability record · CVE-2026-44593 · published 28 May 2026

CVE-2026-44593: Path traversal 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 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.

8.7 CVSS 4.0 High EPSS 0.50% · top 59.9% CWE-22 · Path traversal Deferred
8.7CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-44593), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.