CVE-2026-48163: MariaDB: wsrep SST unsafe parameter handling on the donor side (rsync)

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-10-26
Weakness: CWE-78

Description

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.

Affected products

MariaDB: from 10.6.1 before 10.6.27; from 10.11.1 before 10.11.18; from 11.4.1 before 11.4.12; from 11.8.1 before 11.8.8; 12.3.1 — fixed in 10.6.27, 10.11.18, 11.4.12, 11.8.8

How to fix

Upgrade to a fixed version: MariaDB 10.6.27, 10.11.18, 11.4.12, 11.8.8. Check the vendor advisory for mitigations.

References

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