CVE-2026-42497
Published: May 28, 2026Last modified: May 30, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | HIGH |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | perl | Vulnerable (5.36.0-r0) |
| 25 LTS | perl | Vulnerable (5.40.2-r0) | |
| Stream | perl | Vulnerable (5.36.0-r0) | |
| Hardened Containers | 23 LTS | perl | Vulnerable (5.36.0-r0) |
| 25 LTS | perl | Vulnerable (5.40.2-r0) | |
| Stream | perl | Vulnerable (5.36.0-r0) |