Junrar up to 7.6.0 LocalFolderExtractor LocalFolderExtractor.java LocalFolderExtractor.makeFile path traversal

Summaryinfo

A vulnerability was found in Junrar up to 7.6.0. It has been declared as problematic. This vulnerability affects the function LocalFolderExtractor.makeFile of the file src/main/java/com/github/junrar/LocalFolderExtractor.java of the component LocalFolderExtractor. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2026-86071. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Junrar up to 7.6.0. This vulnerability affects the function LocalFolderExtractor.makeFile of the file src/main/java/com/github/junrar/LocalFolderExtractor.java of the component LocalFolderExtractor. 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, and availability. CVE summarizes:

Junrar is an open source Java RAR archive library. Prior to version 7.6.1, LocalFolderExtractor in src/main/java/com/github/junrar/LocalFolderExtractor.java can create directories outside the intended extraction root when processing a crafted archive entry. LocalFolderExtractor.createFile() validates only the final canonical file path, while LocalFolderExtractor.makeFile() creates intermediate path segments with unchecked mkdir() calls. An entry can therefore make the final path resolve inside the destination while causing intermediate directory creation outside it, enabling filesystem pollution or file-versus-directory squatting that can make later security-sensitive writes fail. The demonstrated impact is directory creation, not unconditional arbitrary file-content write. This issue is fixed in version 7.6.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-86071 since 09/04/2026. 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. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 7.6.1 eliminates this vulnerability.

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Productinfo

Name

• Junrar

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6.0

Website

• Product: https://github.com/junrar/junrar/

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