VULNERABILITY INTELLIGENCE

CVE-2026-18508

CVSS score4.4 MEDIUM
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-08-03
Last modified2026-10-30
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-59

Primary references