Critical severity · published Oct 16, 2026
CVE-2026-85748
MariaDB: Use-after-free with a large number of SYS_REFCURSOR's
9.9
CVSS
1.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
server · MariaDB
>= 12.3.1, < 12.3.3; >= 13.0.1, < 13.0.2 · source: vendor
MA
Mariadb · Mariadb
12.3.1 before 12.3.3; 13.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85748
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-85748
Patch
https://github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1
Patch
https://github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed
Release Notes
https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3
Release Notes
https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2
Vendor Advisory
https://github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm
Issue Tracking
https://jira.mariadb.org/browse/MDEV-40396
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