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.

Score
CVSS 3.1 4.4 Medium
Status
Modified - secalert@redhat.com
Published
2026-08-03
Last modified
2026-09-22
Weaknesses
CWE-59

Affected products

References

 
 
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