CVE-2025-65025: esm.sh Path Traversal

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.

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CVSS v3.1 Score

8.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
esm	esm.sh	< 136

References

Advisories & Patches

https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16 https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw

Exploits

https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2025-65025? +

CVE-2025-65025 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-65025? +

CVE-2025-65025 affects products from esm, specifically: esm.sh. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-65025? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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