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

Detect and mitigate CVE-2026-29786 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →