Medium 4.4Published Aug 3, 2026

CVE-2026-18508Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

Updated under an hour ago (Oct 26, 2026, 2:00 PM ET)

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It affects Red Hat Enterprise Linux 10 and 6 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat Enterprise Linux 10

Exploited in the last 30 days

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: 4.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-59
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Sep 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:1.35-13.el10_2 not affected	CNA record
Red Hat Red Hat Discovery 2 redhat:discovery	from 1788205779 not affected	CNA record
Red Hat Red Hat Hardened Images redhat:hummingbird	from 1.35-9.2.hum1 not affected	CNA record
Red Hat Red Hat Update Infrastructure 5 redhat:rhui	from 1788880445 not affected	CNA record
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CNA record
gnu tar gnu:tar	1.35	NVD
redhat openshift_container_platform redhat:openshift_container_platform	4.0	NVD
redhat enterprise_linux redhat:enterprise_linux	8.0; 9.0; 10.0	NVD

References

References

https://access.redhat.com/errata/RHSA-2026:50807	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:61581	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:61586	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:61783	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:66018	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:70390	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-18508	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2509843	issue-tracking, x-refsource-redhat, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.