Use After Free in Mariadb Server
CVE-2026-85748
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Mariadb Server — versions >= 12.3.1, < 12.3.3, >= 13.0.1, < 13.0.2
Weakness classification (CWE)
References
- github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm
- github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1
- github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed
- github.com/MariaDB/server/releases/tag/mariadb-12.3.3
- github.com/MariaDB/server/releases/tag/mariadb-13.0.2
- jira.mariadb.org/browse/MDEV-40396
- jira.mariadb.org/browse/MDEV-40639
Frequently asked questions
- What is CVE-2026-85748?
- CVE-2026-85748 is a critical-severity vulnerability in Mariadb Server, classified under Use After Free. CVSS score: 9.9/10. Published 2026-10-16.
- How severe is CVE-2026-85748?
- Critical severity. CVSS v3 base score is 9.9 out of 10.