CVE-2026-18508: Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

Overview

Severity

Medium (CVSS 4.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-07

Last Updated

2026-09-07

EPSS Score

0.14% (percentile: 3.8%)

Affected Products (1)

Other

• 20131-17084

Security Updates (1)

• Security Update

Revision History

• 2026-08-07: Information published.
• 2026-09-07: Information published.