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Vulnerability record · CVE-2026-18508 · published 3 August 2026

CVE-2026-18508: Gnu tar link following vulnerability

Gnu · Tar

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.

4.4 CVSS 3.1 Medium EPSS 0.14% · top 97.2% CWE-59 · Link following
4.4CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References
22 Sep 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:50807 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:61581
https://access.redhat.com/errata/RHSA-2026:61586
https://access.redhat.com/errata/RHSA-2026:61783
https://access.redhat.com/errata/RHSA-2026:66018
https://access.redhat.com/errata/RHSA-2026:70390
https://access.redhat.com/security/cve/CVE-2026-18508 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2509843 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-18508), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.