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Ubuntu Security NoticesUSN-8704-1

USN-8704-1: GNU cpio vulnerabilities

It was discovered that cpio incorrectly sanitized hard-link targets when extracting tar archives in copy-in mode. If a user or automated system were tricked into extracting a specially crafted tar archive, an attacker could possibly use this issue to create hard links to files outside the extraction directory, even when using the --no-absolute-filenames option. (CVE-2026-66484) It was discovered that cpio did not properly bound the stack memory allocated for pathnames during archive extraction. If a user or automated system were tricked into extracting a specially crafted cpio archive, an attacker could possibly use this issue to cause cpio to crash, resulting in a denial of service. (CVE-2026-66485) It was discovered that cpio did not properly escape archive member names when listing archive contents. If a user or automated system were tricked into listing a specially crafted archive, an attacker could possibly use this issue to inject misleading output or malicious terminal control sequences. (CVE-2026-66486)

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Vulnerabilities

CVEs named in this advisory

CVE-2026-66484View CVSS, KEV, EPSS, and threat contextCVE-2026-66485View CVSS, KEV, EPSS, and threat contextCVE-2026-66486View CVSS, KEV, EPSS, and threat context
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