CVE-2026-18508
MEDIUMGNU tar --one-top-level - Hardlink Arbitrary File Overwrite
Title source: manualDescription
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.
References (3)
Core 3
Core References
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-18508
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2509843
https://bugzilla.redhat.com/show_bug.cgi?id=2509843
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:50807
https://access.redhat.com/errata/RHSA-2026:50807
Scores
CVSS v3
4.4
EPSS
0.0013
EPSS Percentile
3.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-59
Status
published
Products (8)
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Hardened Images
Red Hat/Red Hat Hardened Images
1.35-9.2.hum1
Red Hat/Red Hat OpenShift Container Platform 4
Published
Aug 03, 2026
Tracked Since
Aug 03, 2026