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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.
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Initial Analysis by NIST8/18/2026 12:36:55 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
*cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
*cpe:2.3:a:gnu:tar:1.35:*:*:*:*:*:*:*
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:50807 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-18508 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2509843 Types: Issue Tracking, Vendor Advisory
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New CVE Received from Red Hat, Inc.8/03/2026 12:16:28 PM
Action
Type
Old Value
New Value
Added
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.
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Quick Info
CVE Dictionary Entry: CVE-2026-18508 NVD
Published Date: 08/03/2026 NVD
Last Modified: 08/21/2026
Source: Red Hat, Inc.
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