What’s Vulnerable › Vulnerabilities

CVE-2026-85748: MariaDB: Use-after-free with a large number of SYS_REFCURSOR's

• Severity: critical (CVSS 9.9 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: 2026-10-16 · updated 2026-10-20
• Weakness: CWE-416

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.

Affected products

• MariaDB: from 12.3.1 before 12.3.3; 13.0.1 (and their updates) — fixed in 12.3.3

How to fix

Upgrade to a fixed version: MariaDB 12.3.3. Check the vendor advisory for mitigations.

References

• https://github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1
• https://github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed
• https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3
• https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2
• https://github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm
• https://jira.mariadb.org/browse/MDEV-40396
• https://jira.mariadb.org/browse/MDEV-40639

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