It was discovered that libarchive incorrectly handled symlinks. If a user or automated system were tricked into processing a specially crafted archive, an attacker could possibly use this issue to change modes, times, ACLs, and flags on arbitrary files. (CVE-2021-23177, CVE-2021-31566) It was discovered that libarchive incorrectly handled certain RAR archives. If a user or automated system were tricked into processing a specially crafted RAR archive, an attacker could use this issue to cause libarchive to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-36976)
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