Bug#1138860: Archive-Tar: CVE-2026-42496

[Niko Tyni]

Package: perl
Version: 5.40.1-6
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org
Forwarded: https://github.com/jib/archive-tar-new/commit/17c873492a05eddc0de18c1485e0b2cccd5a9158
Control: found -1 5.32.1-4
Control: found -1 5.36.0-1
Control: found -1 5.42.2-1

The following vulnerability was published[0] for Archive-Tar (bundled with perl):

  CVE ID:  CVE-2026-42496
  Distribution:  Archive-Tar
  Versions:  before 3.08

  MetaCPAN:  https://metacpan.org/dist/Archive-Tar
  VCS Repo:  https://github.com/jib/archive-tar-new

  Archive::Tar versions before 3.08 for Perl extract symlinks with
  attacker controlled targets outside the extraction directory
  
  Description
  -----------
  Archive::Tar versions before 3.08 for Perl extract symlinks with
  attacker controlled targets outside the extraction directory.
  
  _make_special_file() passes the tar header's linkname to symlink()
  without validating it against absolute paths or .. segments. The
  secure-extract mode check that guards regular file extraction does not
  cover the symlink target.
  
  A subsequent open through the extracted name reads or writes the
  attacker chosen path.
  
[0] https://lists.security.metacpan.org/cve-announce/msg/40396459/

-- 
Niko Tyni       ntyni at debian.org