High 8.2Published Nov 19, 2025

CVE-2025-65025esm.sh CDN service has arbitrary file write via tarslip

Updated under an hour ago (Oct 27, 2026, 2:23 AM ET)

Does this affect you?

It affects esm-dev esm.sh and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for esm-dev esm.sh

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Nov 20, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

esm-dev esm.sh esm_dev:esm.sh (from the name)	before 136	CNA record
esm esm.sh esm:esm.sh	before 136	NVD

References

References

https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw	x-refsource-confirm, exploit, vendor-advisory
https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.