CVE-2026-31802: Isaacs Tar

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.

Affected products

• Isaacs Tar: before 7.5.11 (fixed in 7.5.11)

Published 2026-03-10. Last modified 2026-06-17.