xz is a compression and decompression library focusing on the xz format completely written in Go. The function readUvarint used to read the xz container format may not terminate a loop provide malicous input.
The problem has been fixed in release v0.5.8.
Limit the size of the compressed file input to a reasonable size for your use case.
The standard library had recently the same issue and got the CVE-2020-16845 allocated.
If you have any questions or comments about this advisory: * Open an issue in xz.