CVE-2025-65025

esm.sh CDN service has arbitrary file write via tarslip

Published Nov 19, 2025 CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Description
esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, the esm.sh CDN service is vulnerable to path traversal during NPM package tarball extraction. An attacker can craft a malicious NPM package containing specially crafted file paths (e.g., package/../../tmp/evil.js). When esm.sh downloads and extracts this package, files may be written to arbitrary locations on the server, escaping the intended extraction directory. This issue has been patched in version 136.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-h3mw-4f23-gwpw esm.sh CDN service has arbitrary file write via tarslip
History
Type Values Removed Values Added
First Time appeared Esm
Esm esm.sh
CPEs cpe:2.3:a:esm:esm.sh:*:*:*:*:*:*:*:*
Vendors & Products Esm
Esm esm.sh
Type Values Removed Values Added
First Time appeared Esm-dev
Esm-dev esmsh
Vendors & Products Esm-dev
Esm-dev esmsh
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, the esm.sh CDN service is vulnerable to path traversal during NPM package tarball extraction. An attacker can craft a malicious NPM package containing specially crafted file paths (e.g., package/../../tmp/evil.js). When esm.sh downloads and extracts this package, files may be written to arbitrary locations on the server, escaping the intended extraction directory. This issue has been patched in version 136.
Title esm.sh CDN service has arbitrary file write via tarslip
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 20, 2025, 2:09 PM
Reserved
Nov 13, 2025, 3:36 PM
Status
Analyzed
Published
Nov 19, 2025, 6:15 PM
Modified
Oct 18, 2026, 8:10 PM