CVE-2026-66484

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

Database specific

{
    "cna_assigner":  "CERT-PL",
    "cwe_ids":  [
        "CWE-22"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66484.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "last_affected":  "2.15"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StandardRange"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "last_affected":  "2.15"
                        }
                    ],
                    "source":  "CPE_FIELD",
                    "strategy":  "CPEApplicability"
                }
            ]
        }
    ]
}

References

Affected packages

Git / git.savannah.gnu.org/cgit/cpio.git

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Fixed

e2b9cbdd3354d2b1569b7390d1bc15c1930559ad

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "e2b9cbdd3354d2b1569b7390d1bc15c1930559ad"
                }
            ],
            "source":  "DESCRIPTION"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "e2b9cbdd3354d2b1569b7390d1bc15c1930559ad"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66484.json"