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4.6 Medium

CVE-2026-66484 GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality

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

Affected products and versions

Product Affected versions Fixed in
cpio 2.15 earliest → 2.15 No fix stated

References

Timeline

  1. Published
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Other CVEs of cpio

The 3 CVEs of cpio →
CVE-2026-66486 GNU cpio is vulnerable to improper encoding or escaping of output in its archive member listing functionality 4.6 Medium CVE-2026-66485 GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c 4.6 Medium
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