Due to CVE-2020-29488, Percona XtraBackup is modifying how xbstream handles absolute paths to prevent malicious file injections. Like the tar archiving utility, the new behavior removes the leading / character and references to the parent directory. Fixes are available in Percona XtraBackup versions: >= 2.4.22 >= 8.0.23-16.0 For example, ../../../d1/../d2/h.txt will be saved in the [&]

https://www.percona.com/blog/2021/03/23/cve-2020-29488-changes-in-how-absolute-paths-are-handled-in-percona-xtrabackup-xbstream/