CVE-2026-43637: Preferredai Cornac

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Preferredai Cornac: before 2.6.0 (fixed in 2.6.0)

Published 2026-07-15. Last modified 2026-07-15.