What is CVE-2025-65025?

CVE-2025-65025 is a high-severity vulnerability in Esm Esm.sh, classified under Path Traversal. CVSS score: 8.2/10. Published 2025-11-19.

How severe is CVE-2025-65025?

High severity. CVSS v3 base score is 8.2 out of 10.

Path Traversal in Esm Esm.sh

CVE-2025-65025

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.005 (42.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.

Affected products

Esm Esm.sh
Esm-dev Esm.sh — versions < 136

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-65025?: CVE-2025-65025 is a high-severity vulnerability in Esm Esm.sh, classified under Path Traversal. CVSS score: 8.2/10. Published 2025-11-19.
How severe is CVE-2025-65025?: High severity. CVSS v3 base score is 8.2 out of 10.