PT-2026-43162 · Cpan+1 · Archive Tar+1

Stig Palmquist · Published 2026-05-26 · Updated 2026-06-30 · CVE-2026-42496

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Archive::Tar versions prior to 3.08

Description Archive::Tar for Perl allows the extraction of symlinks with attacker-controlled targets located outside the extraction directory. The function make special file() passes the tar header's linkname to symlink() without validating it against absolute paths or .. segments. While a secure-extract mode exists to guard regular file extraction, it does not cover the symlink target. Consequently, a subsequent open operation through the extracted name can read or write to an attacker-chosen path.

Recommendations Update Archive::Tar to version 3.08 or later.

Exploit

Fix

DoS

Path traversal

Link Following

Weakness Enumeration

CWE-22

CWE-59

Related Identifiers

ALSA-2026:30851

ALSA-2026:30852

ALSA-2026:30856

ALSA-2026:30857

CVE-2026-42496

ECHO-1732-BCF6-7970

OESA-2026-2678

RHSA-2026:30851

RHSA-2026:30852

RHSA-2026:30856

RHSA-2026:30857

USN-8467-1

Affected Products

Archive Tar

Rocky Linux

References · 53

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42496.json · Exploit
• https://github.com/jib/archive-tar-new/commit/17c873492a05eddc0de18c1485e0b2cccd5a9158.patch · Patch
• https://access.redhat.com/errata/RHSA-2026:30852 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42496 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-42496 · Vendor Advisory
• https://errata.almalinux.org/10/ALSA-2026-30857.html · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:30851 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8467-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-42496 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:30856 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42496 · Security Note
• https://access.redhat.com/errata/RHSA-2026:30851 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42496 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42496 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-42496 · Vendor Advisory