esm-dev esm.sh prior 0.0.0-20260116051925-c62ab83c589e tar path.Clean path traversal

Summaryinfo

A vulnerability has been found in esm-dev esm.sh and classified as critical. This impacts the function path.Clean of the component tar Handler. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2026-23644. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in esm-dev esm.sh. This affects the function path.Clean of the component tar Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

esm.sh is a no-build content delivery network (CDN) for web development. Prior to Go pseeudoversion 0.0.0-20260116051925-c62ab83c589e, the software has a path traversal vulnerability due to an incomplete fix. `path.Clean` normalizes a path but does not prevent absolute paths in a malicious tar file. Commit https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16, corresponding to pseudoversion 0.0.0-20260116051925-c62ab83c589e, fixes this issue.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-23644 since 01/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 0.0.0-20260116051925-c62ab83c589e eliminates this vulnerability. Applying the patch 9d77b88c320733ff6689d938d85d246a3af9af16 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• esm-dev

Name

• esm.sh

License

• open-source

Website

• Product: https://github.com/esm-dev/esm.sh/

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