Description of problem: https://www.openwall.com/lists/oss-security/2024/03/29/4
The backdoor never made it into Mageia. Mageia 8 has xz 5.4.3 Cauldron has xz 5.4.6 The backdoor was introduced in version 5.6.0 with further changes in 5.6.1, neither of which were ever imported into Mageia.
CC: (none) => davidwhodginsStatus: NEW => RESOLVEDResolution: (none) => INVALID
See https://tukaani.org/xz-backdoor/ and https://gynvael.coldwind.pl/?lang=en&id=782 for details of how the backdoor worked and was introduced.