CVE-2026-29786: tar has Hardlink Path Traversal via Drive-Relative Linkpath

March 5, 2026 (updated March 9, 2026)

tar (npm) 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.

References

github.com/advisories/GHSA-qffp-2rhf-9h96
github.com/isaacs/node-tar
github.com/isaacs/node-tar/commit/7bc755dd85e623c0279e08eb3784909e6d7e4b9f
github.com/isaacs/node-tar/security/advisories/GHSA-qffp-2rhf-9h96
nvd.nist.gov/vuln/detail/CVE-2026-29786

Code Behaviors & Features

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