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
This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad
Advisories
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Fixes
Solution
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Workaround
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References
History
Mon, 10 Aug 2026 11:30:00 +0000
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ssvc
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Mon, 10 Aug 2026 10:30:00 +0000
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| 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 | |
| Title | Path Traversal in GNU cpio | |
| First Time appeared |
Gnu
Gnu cpio |
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| Weaknesses | CWE-22 | |
| CPEs | cpe:2.3:a:gnu:cpio:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Gnu
Gnu cpio |
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| References |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: CERT-PL
Published:
Updated: 2026-08-10T10:57:14.423Z
Reserved: 2026-07-27T11:32:08.682Z
Link: CVE-2026-66484
Updated: 2026-08-10T10:57:10.205Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-08-10T11:30:16Z
Weaknesses