CVE-2026-29786: Isaacs Tar

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

node-tar is a full-featured Tar for Node.js. Prior to version 7.5.10, tar can be tricked into creating a hardlink that points outside the extraction directory by using a drive-relative link target such as C:../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This issue has been patched in version 7.5.10.

Affected products

• Isaacs Tar: before 7.5.10 (fixed in 7.5.10)

Published 2026-03-07. Last modified 2026-09-01.