CVE-2026-42497

Summary

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.

Affected Software

VendorProductVersion RangeStatus
BINGOSArchive::Tar0 < 3.08affected

Weaknesses

  • CWE-59: CWE-59 Improper Link Resolution Before File Access ('Link Following')
  • CWE-732: CWE-732 Incorrect Permission Assignment for Critical Resource

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References