VulnerabilityAnalyzed

CVE-2025-65025

Prior to version 136, the esm.sh CDN service is vulnerable to path traversal during NPM package tarball extraction.

CRITICAL 9.8EPSS 0.53%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.53% probability · 43th percentile
CISA KEV: Not listed
Weakness: CWE-22
Affected: esm/esm.sh
Source: security-advisories@github.com

References

https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16Patch
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpwExploit, Vendor Advisory
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpwExploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.