CVE-2026-18508

MediumCVSS 4.4/10Last modified Sep 22, 2026

Description

A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.

Metrics

CVSS 3.1 4.4/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-59

Affected software

No affected versions have been published.

Timeline

Published: Aug 3, 2026
Last modified: Sep 22, 2026
NVD status: Modified

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