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

Source: https://junglewise.ai/threats/cve-2025-65025-esm-sh-cdn-service-has-arbitrary-file-write-via-tarslip  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-11-19  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-esm-dev-esm-sh). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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

## Related threats

- [esm-dev esm.sh path traversal in package.json browser field](https://junglewise.ai/threats/cve-2026-44594-esm-dev-esm-sh-path-traversal-in-package-json-browser-field)
- [esm.sh path traversal in legacy router leads to arbitrary file write](https://junglewise.ai/threats/cve-2026-44593-esm-sh-path-traversal-in-legacy-router-leads-to-arbitrary-file)
- [GO-2026-4554 - esm.sh has SSRF localhost/private-network bypass in `/http(s)` module route in github.com/esm-dev/esm.sh](https://junglewise.ai/threats/cve-2026-27730-esm-sh-has-ssrf-localhost-private-network-bypass-in-http-s-module)
- [GO-2026-4332 - esm.sh has a path traversal in extractPackageTarball enables file writes from malicious packages](https://junglewise.ai/threats/cve-2026-23644-esm-sh-has-a-path-traversal-in-extractpackagetarball-enables-file)
- [GO-2026-4545 - esm.sh is vulnerable to full-response SSRF in github.com/esm-dev/esm.sh](https://junglewise.ai/threats/cve-2025-50180-esm-sh-is-vulnerable-to-full-response-ssrf)