CVE-2026-18508

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Aug 3, 2026
Source updated: Sep 22, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

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.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Red Hat Enterprise Linux 10

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10
Platforms: Unknown
Default status: affected
Package: tar
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
2:1.35-13.el10_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: tar
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
2:1.30-13.el8_10	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: tar
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
2:1.34-13.el9_8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Discovery 2

Vendor: Red Hat
Product: Red Hat Discovery 2
Platforms: Unknown
Default status: affected
Package: discovery/discovery-server-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Discovery 2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788205779	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Hardened Images

Vendor: Red Hat
Product: Red Hat Hardened Images
Platforms: Unknown
Default status: affected
Package: tar-main
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Hardened Images · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1.35-9.2.hum1	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Update Infrastructure 5

Vendor: Red Hat
Product: Red Hat Update Infrastructure 5
Platforms: Unknown
Default status: affected
Package: rhui5/cds-kubernetes-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Update Infrastructure 5 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788880445	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Update Infrastructure 5

Vendor: Red Hat
Product: Red Hat Update Infrastructure 5
Platforms: Unknown
Default status: affected
Package: rhui5/cds-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Update Infrastructure 5 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788880464	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Update Infrastructure 5

Vendor: Red Hat
Product: Red Hat Update Infrastructure 5
Platforms: Unknown
Default status: affected
Package: rhui5/haproxy-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Update Infrastructure 5 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788880456	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Update Infrastructure 5

Vendor: Red Hat
Product: Red Hat Update Infrastructure 5
Platforms: Unknown
Default status: affected
Package: rhui5/installer-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Update Infrastructure 5 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788765051	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Update Infrastructure 5

Vendor: Red Hat
Product: Red Hat Update Infrastructure 5
Platforms: Unknown
Default status: affected
Package: rhui5/rhua-rhel9
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Update Infrastructure 5 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788880581	`unaffected`	rpm	*	Unavailable	None listed