CVE-2026-66484

Path Traversal in GNU cpio

Published: Aug 10, 2026Updated: Aug 28, 2026 Sources: CVE List NVDCWE-22

N/ACVSS

NVD MITRE

Description

GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the link_to_name function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files. This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad

No summary for this CVE yet.

Weaknesses

CWE-22

Affected Products

GNU

oss-project·USaka g. nu

cpio

OSS Libraries

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://cert.pl/en/posts/2026/08/CVE-2026-66484

cert.pl

https://git.savannah.gnu.org/cgit/cpio.git

git.savannah.gnu.org

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