CVE-2026-85748 MariaDB: Use-after-free with a large number of SYS_REFCURSOR's
A low-privileged attacker can trigger a use-after-free in MariaDB via SYS_REFCURSOR handling, potentially enabling remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-85748?
CVE-2026-85748 is a critical use after free vulnerability in Mariadb Mariadb, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MariaDB server is a community developed fork of MySQL server. From 12.3.1 until 12.3.3 and 13.0.2, 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 issue is fixed in versions 12.3.3 and 13.0.2.
Weakness: CWE-416
Which versions are affected by CVE-2026-85748?
3 open source packages ship an affected version, including mariadb, mariadb-min and mysql-client. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mariadb Bitnami | From 12.3.1 | 12.3.3, 13.0.2 |
mariadb-min Bitnami | From 12.3.1 | 12.3.3, 13.0.2 |
mysql-client Bitnami | From 12.3.1 | 12.3.3, 13.0.2 |
Products include Mariadb Mariadb.
How do I fix CVE-2026-85748?
Upgrade mariadb to a fixed version for your release line: 12.3.3 or 13.0.2.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-85748 being exploited?
There is no known exploitation of CVE-2026-85748 in the wild and no public exploit code.
Other vulnerabilities in Mariadb Mariadb
- CVE-2026-49261 MariaDB server has unsafe parameter handling in `wsrep_notify_cmd`
- CVE-2026-85746 MariaDB: Out-of-bound buffer write on in `ST_AsText` of nested GeometryCollections
- CVE-2026-92262 MariaDB: Numerous issues caused by historical #mysql50# tablename encoding bypass.
- CVE-2023-26785 Code injection in n/a
- CVE-2026-97380 MariaDB: GRANT PROXY with empty password incorrectly checks grantor's privileges
Sources
Also known as BIT-mariadb-2026-85748, BIT-mariadb-min-2026-85748, BIT-mysql-client-2026-85748, GHSA-mv8g-9f7q-hprm, UBUNTU-CVE-2026-85748.