Vulnerability Details CVE-2026-18508
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 3.6%
CVSS Severity
CVSS v3 Score 4.4
References
Products affected by CVE-2026-18508
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cpe:2.3:a:gnu:tar:1.35
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cpe:2.3:a:redhat:openshift_container_platform:4.0
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cpe:2.3:o:redhat:enterprise_linux:9.0