CVE-2026-86047

In MariaDB from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, the GRANT PROXY statement treats an IDENTIFIED clause with an empty password as though authentication were not specified, checking the wrong grantor privileges. A low-privileged attacker who can name another account can set that account's password.

In MariaDB from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, the CONNECT engine plugin file-access UDFs json_file(), bson_file(), jfile_make(), bfile_make(), and jbin_file() do not enforce FILE privilege or the secure_file_priv setting. A low-privileged attacker can call such a UDF with a filesystem path to read or write files the database account is not authorized to access.

In MariaDB from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ST_Area reads beyond the allocated buffer when processing invalid WKB for a MultiPolygon because the parser advances past a nested geometry header without verifying enough input remains. A low-privileged remote attacker can supply malformed spatial data to disclose memory useful for bypassing ASLR.

In MariaDB server, the #mysql50# bypass prefix allows the #mysql50# prefix to bypass normal table-name filesystem encoding. An attacker can trigger the issue with a table name using the #mysql50# prefix, then use a #mysql50# table name to access files under their legacy unencoded name, causing crashes, data corruption, data exfiltration, or remote code execution. This affects versions from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.

In MariaDB server, SYS_REFCURSOR handling is affected because cursor-array reallocation can leave stale references in routine contexts. A low-privileged attacker can open a large number of SYS_REFCURSORs and then fetch one to trigger a use-after-free that can enable remote code execution when combined with another vulnerability. This affects versions from 12.3.1 until 12.3.3 and 13.0.2.

In MariaDB server, ST_AsText can write beyond an allocated output buffer when converting deeply nested GeometryCollections because recursive WKT serialization does not account for bytes consumed or reserve sufficient space. A low-privileged remote attacker can submit a specially crafted GIS object to corrupt memory and potentially achieve code execution when combined with another vulnerability. This affects versions from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.

SQL injection vulnerability in MariaDB (versions 3.3.18 and 3.4.8) despite using mysql_real_escape_string() with big5 charset. Fixed in versions 3.3.19 and 3.4.9.

A vulnerability in MariaDB on Windows with the CONNECT engine installed and REST support enabled allows interpolation of the table HTTP attribute into the curl command line without proper sanitization. This enables the user to execute shell commands on the server.

MariaDB from 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, the view FRM parser did not safely encode embedded newline characters in a username. An account with CREATE USER and CREATE VIEW WITH GRANT OPTION could create a crafted username containing additional view metadata, potentially escalating database privileges.

MariaDB server, a community developed fork of MySQL server, versions 10.6.1 through 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, has a vulnerability in the ACL cache that could generate the same database-privilege cache key for role and localhost user names that matched because both used an empty IP component. An attacker with CREATE USER could create the colliding principal and, when the original principal's database privileges were cached, exercise privileges assigned to the other account. This issue is fixed in versions 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.