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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85748
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-16 17:17:51 UTC
Updated2026-10-20 15:32:54 UTC
DescriptionMariaDB 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.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.005460000 probability, percentile 0.447210000 (date 2026-10-20)

Problem Types: CWE-416 | CWE-416 CWE-416: Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mariadb Mariadb All All All All
Application Mariadb Mariadb 13.0.1 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA MariaDB Server affected >= 12.3.1, < 12.3.3 Not specified
CNA MariaDB Server affected >= 13.0.1, < 13.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/MariaDB/server/releases/tag/mariadb-13.0.2 [email protected] github.com Release Notes
github.com/MariaDB/server/commit/91156c3de58762196605150ab3f756fe952592d1 [email protected] github.com Patch
github.com/MariaDB/server/security/advisories/GHSA-mv8g-9f7q-hprm [email protected] github.com Vendor Advisory
github.com/MariaDB/server/commit/9b075b2cb53338f67e7230cc585e02d2d34514ed [email protected] github.com Patch
jira.mariadb.org/browse/MDEV-40396 [email protected] jira.mariadb.org Issue Tracking
jira.mariadb.org/browse/MDEV-40639 [email protected] jira.mariadb.org Issue Tracking
github.com/MariaDB/server/releases/tag/mariadb-12.3.3 [email protected] github.com Release Notes
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