---
id: CVE-2026-85748
title: 'MariaDB: Use-after-free with a large number of SYS_REFCURSOR''s'
summary: >-
  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 atta…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-416
vendor: MariaDB
product: server
affected:
  - 'server >= 12.3.1, < 12.3.3'
  - 'server >= 13.0.1, < 13.0.2'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T16:54:30.361781Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T16:54:40.841Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-85748'
references:
  - url: 'https://github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm'
    label: 'https://github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm'
  - url: >-
      https://github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1
    label: >-
      https://github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1
  - url: >-
      https://github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed
    label: >-
      https://github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2'
  - url: 'https://jira.mariadb.org/browse/MDEV-40396'
    label: 'https://jira.mariadb.org/browse/MDEV-40396'
  - url: 'https://jira.mariadb.org/browse/MDEV-40639'
    label: 'https://jira.mariadb.org/browse/MDEV-40639'
tags:
  - cve.org
ingestedAt: '2026-10-16T17:24:46.897Z'
---

## Overview

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

- `server >= 12.3.1, < 12.3.3`
- `server >= 13.0.1, < 13.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.