isomorphic-git up to 1.38.5 Tree Parser src/models/GitTree.js path traversal

Summaryinfo

A vulnerability described as problematic has been identified in isomorphic-git up to 1.38.5. Affected by this vulnerability is an unknown functionality of the file src/models/GitTree.js of the component Tree Parser. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2026-63478. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in isomorphic-git up to 1.38.5. It has been declared as problematic. This vulnerability affects an unknown code block of the file src/models/GitTree.js of the component Tree Parser. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git's tree parser in src/models/GitTree.js accepts a standalone .. tree-entry name because it rejects only path separators. During clone or checkout from a malicious or man-in-the-middle-controlled non-GitHub remote, nested .. entries can escape the working-tree root and write files at attacker-selected parent paths on any host-backed fs provider. The arbitrary file write can overwrite startup or configuration files and lead to code execution. GitHub-hosted trees are not a direct source because GitHub rejects .. entries during repository integrity checks. This issue is fixed in version 1.38.6.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-63478 since 07/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.38.6 eliminates this vulnerability.

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Productinfo

Type

• Versioning Software

Name

• isomorphic-git

Version

• 1.38.0
• 1.38.1
• 1.38.2
• 1.38.3
• 1.38.4
• 1.38.5

Website

• Product: https://github.com/isomorphic-git/isomorphic-git/

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