Vulnerability Report

CVE-2026-42497

Title: Arbitrary Hardlink Creation in Archive::Tar

Arbitrary File Creation

Proof Of Concept

No public PoC currently indexed for CVE-2026-42497.

CWE Category CWE-59

Published Date May 26, 2026

Modified Date May 28, 2026

Exploit Status Not Found

Score 7.5 CVSS v

Exploit Probability (EPSS)

0.42%

Vulnerability Summary

CVE-2026-42497: 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.

Impacted Vendors

archive\ 1

file\ 1

Reference Links

https://github.com/jib/archive-tar-new/commit/17c873492a05eddc0de18c1485e0b2cccd5a9158.patch https://metacpan.org/release/BINGOS/Archive-Tar-3.08/changes https://www.cve.org/CVERecord?id=CVE-2026-42496

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42497 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 28, 2026 MODIFIED

Vulnerability data updated via NVD.

May 27, 2026 MODIFIED

Vulnerability data updated via NVD.

May 26, 2026 MODIFIED

Vulnerability data updated via NVD.

May 26, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Stack

No specific products linked.