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CVE-2026-66484 is a path-traversal flaw in GNU cpio tar archive extraction. In copy-in mode, when --no-absolute-filenames is used, cpio normalizes the archive member pathname but does not apply equivalent sanitization to a tar hard-link entry's link target before passing it to the hard-link creation logic. A crafted tar archive can therefore specify an absolute hard-link target outside the extraction directory, defeating the expected containment provided by --no-absolute-filenames. GNU cpio versions through 2.15 are affected. The upstream fix sanitizes the hard-link target before link creation.
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A cpio tar-archive extraction flaw that permits a crafted archive to create hard links outside the intended extraction directory.
A cpio tar-archive extraction sanitization flaw that permits a malicious archive to create hard links outside the intended extraction directory.
A referenced vulnerability listed in the advisory metadata, without technical details in the provided content.
A path traversal vulnerability in GNU cpio tar archive extraction that allows a crafted archive to create a hard link to an existing file outside the intended extraction directory, bypassing the expected protection of --no-absolute-filenames.
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