CVE-2026-18508: Tar: tar: --one-top-level hardlink targets not confined to top-level direct

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat Enterprise Linux 10

Default version status: affected

2:1.35-13.el10_2 to < *unaffected

Red Hat Red Hat Enterprise Linux 8

Default version status: affected

2:1.30-13.el8_10 to < *unaffected

Red Hat Red Hat Enterprise Linux 9

Default version status: affected

2:1.34-13.el9_8 to < *unaffected

Red Hat Red Hat Discovery 2

Default version status: affected

1788205779 to < *unaffected

Red Hat Red Hat Hardened Images

Default version status: affected

1.35-9.2.hum1 to < *unaffected

Red Hat Red Hat Update Infrastructure 5

Default version status: affected

1788880445 to < *unaffected

Red Hat Red Hat Update Infrastructure 5

Default version status: affected

1788880464 to < *unaffected

Red Hat Red Hat Update Infrastructure 5

Default version status: affected

1788880456 to < *unaffected

Red Hat Red Hat Update Infrastructure 5

Default version status: affected

1788765051 to < *unaffected

Red Hat Red Hat Update Infrastructure 5

Default version status: affected

1788880581 to < *unaffected

Red Hat Red Hat Enterprise Linux 6

Default version status: unknown

Red Hat Red Hat Enterprise Linux 7

Default version status: unknown

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat Hardened Images

Default version status: unaffected

Red Hat Red Hat OpenShift Container Platform 4

Default version status: affected

Red Hat Red Hat OpenShift Container Platform 4

Default version status: affected

CVE-2026-18508

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

Description

Affected products

Red Hat Red Hat Enterprise Linux 10

Red Hat Red Hat Enterprise Linux 8

Red Hat Red Hat Enterprise Linux 9

Red Hat Red Hat Discovery 2

Red Hat Red Hat Hardened Images

Red Hat Red Hat Update Infrastructure 5

Red Hat Red Hat Update Infrastructure 5

Red Hat Red Hat Update Infrastructure 5

Red Hat Red Hat Update Infrastructure 5

Red Hat Red Hat Update Infrastructure 5

Red Hat Red Hat Enterprise Linux 6

Red Hat Red Hat Enterprise Linux 7

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat Hardened Images

Red Hat Red Hat OpenShift Container Platform 4

Red Hat Red Hat OpenShift Container Platform 4

References