CVE-2026-42497

Severity CVSS v4.0:

Pending analysis

Type:

CWE-59 Link Following

Publication date:

26/05/2026

Last modified:

28/05/2026

Description

Archive::Tar versions before 3.08 for Perl extract hardlinks to attacker controlled paths outside the extraction directory.<br /> <br /> _make_special_file() passes the tar header&#39;s linkname to link() without validating it against absolute paths or .. segments, creating a hardlink that shares the victim file&#39;s inode.<br /> <br /> 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&#39;s mode, owner, and timestamps to the shared inode during extraction alone.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None