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Vulnerabilities CVE-2026-18508

CVE-2026-18508

Medium
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
4.4
EPSS Score
0.14%

3.6th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Confidence
90%
Published
Aug 3, 2026
Last Modified
Aug 21, 2026
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