Path Traversal in Preferredai Cornac
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Preferredai Cornac — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/PreferredAI/cornac/commit/8a50be72c11569b6747c6b96d6e31a0a1962f1a8 (patch)
- github.com/PreferredAI/cornac/pull/709 (issue-tracking)
- github.com/PreferredAI/cornac/releases/tag/v2.6.0 (release-notes)
- www.vulncheck.com/advisories/cornac-path-traversal-via-extract-archive-in-downl… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-43637?
- CVE-2026-43637 is a critical-severity vulnerability in Preferredai Cornac, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-07-15.
- How severe is CVE-2026-43637?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-43637 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.