CVE-2026-42497 – Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory

CVE ID :CVE-2026-42497

Published : May 26, 2026, 12:17 a.m. | 1 hour, 39 minutes ago

Description :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.

Severity: 0.0 | NA

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