CVE-2025-65025: GO-2025-4138 - esm.sh CDN service has arbitrary file write via tarslip in github.com/esm-dev/esm.sh

CVE-2025-65025 · Severity: high · CVSS 8.2 · Published 2025-11-19

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.

Technologies: github.com/esm-dev/esm.sh (Go). Vendors: Go.

Quick answers

Is CVE-2025-65025 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-65025 being exploited in the wild.
How severe is CVE-2025-65025?
High severity, with a CVSS score of 8.2, published 19 November 2025.
Which products and versions are affected?
github.com/esm-dev/esm.sh (Go) SEMVER:introduced=0,fixed=0.0.0-20251117232647-9d77b88c3207.
Is there a fix for CVE-2025-65025?
Yes. github.com/esm-dev/esm.sh (Go): upgrade to 0.0.0-20251117232647-9d77b88c3207 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-65025?
Check whether you run Esm.Sh or github.com/esm-dev/esm.sh (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/esm-dev/esm.sh (Go): upgrade to 0.0.0-20251117232647-9d77b88c3207 or later
    go get github.com/esm-dev/esm.sh@v0.0.0-20251117232647-9d77b88c3207

Affected products

  • Esm.Sh
  • github.com/esm-dev/esm.sh (Go) SEMVER:introduced=0,fixed=0.0.0-20251117232647-9d77b88c3207

Identifiers

  • CVE-2025-65025
  • GHSA-h3mw-4f23-gwpw
  • GO-2025-4138

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