MariaDB server is a community developed fork of MySQL server. From versions 10.6.1 to before 10.6.27, 10.11.1 to before 10.11.18, 11.4.1 to before 11.4.12, 11.8.1 to before 11.8.8, and 12.3.1, during the SST the donor node is interpolating parameters that the joiner sent into the command line. Not all parameters were properly validated which could allow a malicious joiner to execute arbitrary shell commands on the donor side via the rsync SST method. This issue has been patched in versions 10.6.27, 10.11.18, 11.4.12, 11.8.8, and 12.3.2.
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48163.json
https://jira.mariadb.org/browse/MDEV-39648
https://github.com/MariaDB/server/security/advisories/GHSA-rpgv-q6gv-684r
https://bugzilla.redhat.com/show_bug.cgi?id=2488454
https://access.redhat.com/security/cve/CVE-2026-48163
https://access.redhat.com/errata/RHSA-2026:33482
https://access.redhat.com/errata/RHSA-2026:33481
https://access.redhat.com/errata/RHSA-2026:33464
https://access.redhat.com/errata/RHSA-2026:33412
https://access.redhat.com/errata/RHSA-2026:33093