PreferredAI cornac up to 2.5.x TAR cornac/utils/download.py _extract_archive path path traversal

Summaryinfo

A vulnerability has been found in PreferredAI cornac up to 2.5.x and classified as critical. Impacted is the function _extract_archive of the file cornac/utils/download.py of the component TAR Handler. Performing a manipulation of the argument path results in path traversal. This vulnerability was named CVE-2026-43637. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in PreferredAI cornac up to 2.5.x. This affects the function _extract_archive of the file cornac/utils/download.py of the component TAR Handler. The manipulation of the argument path 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, integrity, and availability. The summary by CVE is:

Cornac before 2.6.0 contains a path traversal (Tar Slip) vulnerability that allows attackers to write arbitrary files outside the intended cache directory by supplying a crafted TAR archive containing ../ sequences, absolute paths, or symlink/hardlink entries to the _extract_archive() function in cornac/utils/download.py. Attackers can trigger this vulnerability through the built-in dataset loaders, which automatically download and extract archives, causing archive.extractall() to write files to arbitrary locations on the filesystem accessible to the running process.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-43637 since 05/01/2026. 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 of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.6.0 eliminates this vulnerability.

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Productinfo

Vendor

• PreferredAI

Name

• cornac

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5

Website

• Product: https://github.com/PreferredAI/cornac/

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