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

{
  "id": "639cea2ce76276f3cee925e988c6ceec2b30ca594e14f331bc896c203246887a",
  "url": "https://osv.dev/vulnerability/BIT-mariadb-2026-85748",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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 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.",
    "evidence": "osv:BIT-mariadb-2026-85748",
    "products": [
      {
        "name": {
          "value": "mariadb",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "12.3.3",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "13.0.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "BIT-mariadb-2026-85748",
      "aliases": [
        "BIT-mariadb-2026-85748",
        "BIT-mariadb-min-2026-85748",
        "BIT-mysql-client-2026-85748",
        "CVE-2026-85748",
        "GHSA-mv8g-9f7q-hprm"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "12.3.1"
                },
                {
                  "fixed": "12.3.3"
                },
                {
                  "introduced": "13.0.0"
                },
                {
                  "fixed": "13.0.2"
                }
              ]
            }
          ],
          "package": {
            "name": "mariadb",
            "purl": "pkg:bitnami/mariadb",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/mariadb/BIT-mariadb-2026-85748.json"
          }
        }
      ],
      "modified": "2026-10-22T09:00:03.365318828Z",
      "provider": "osv",
      "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",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-85748"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*"
        ],
        "severity": "Critical"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-85748",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 405340,
  "published_at": "2026-10-21T08:52:56.896+00:00"
}