Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory.
_make_special_file() passes the tar header's linkname to link() without validating it against absolute paths or .. segments, creating a hardlink that shares the victim file's inode.
A subsequent write through the extracted name modifies the victim file, and the post-extraction chmod, chown, and utime block in _extract_file() (guarded only against symlinks via -l) applies the tar header's mode, owner, and timestamps to the shared inode during extraction alone.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perl-Archive-Tar | Jun 9, 2026 | Jun 9, 2026 |
| Debian | — | Upgrade perl | Sep 21, 2026 | May 26, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 26, 2026 |
| Ubuntu | — | Upgrade perl | Aug 25, 2026 | May 26, 2026 |
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