CVE-2026-43637

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.

Score

CVSS 3.1 9.1 Critical

Status

Deferred - disclosure@vulncheck.com

Published

2026-07-15

Last modified

2026-10-24

Weaknesses

CWE-22

Affected products

• Cornac (Preferredai)

References

• https://github.com/PreferredAI/cornac/releases/tag/v2.6.0
• https://github.com/PreferredAI/cornac/pull/709
• https://github.com/PreferredAI/cornac/commit/8a50be72c11569b6747c6b96d6e31a0a1962f1a8
• https://www.vulncheck.com/advisories/cornac-path-traversal-via-extract-archive-in-download-py