CVE-2026-44594
esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, a Local File Inclusion (LFI) vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process.
| CWE | CWE-22 |
| Vendor | esm-dev |
| Product | esm.sh |
| Published | May 28, 2026 |
| Last Updated | May 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
esm-dev / esm.sh
<= 137