---
id: CVE-2026-85745
title: 'MariaDB: Out-of-bound buffer read on in `ST_Area` of a multipolygon.'
summary: >-
  MariaDB server is a community developed fork of MySQL server. From 10.6.1
  until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ST_Area reads
  beyond the allocated buffer when processing invalid WKB for a MultiPolygon
  because the …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-126
vendor: MariaDB
product: server
affected:
  - 'server >= 10.6.1, < 10.6.28'
  - 'server >= 10.11.1, < 10.11.19'
  - 'server >= 11.4.1, < 11.4.13'
  - 'server >= 11.8.1, < 11.8.9'
  - 'server >= 12.3.1, < 12.3.3'
  - 'server >= 13.0.1, < 13.0.2'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T16:30:30.866Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-85745'
references:
  - url: 'https://github.com/MariaDB/server/security/advisories/GHSA-p7v9-24h4-mch8'
    label: 'https://github.com/MariaDB/server/security/advisories/GHSA-p7v9-24h4-mch8'
  - url: >-
      https://github.com/MariaDB/server/commit/2bf355e361db85153fdfba7b8a0f0d114d6a26ce
    label: >-
      https://github.com/MariaDB/server/commit/2bf355e361db85153fdfba7b8a0f0d114d6a26ce
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.6.28'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.6.28'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9'
  - 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-40328'
    label: 'https://jira.mariadb.org/browse/MDEV-40328'
tags:
  - cve.org
ingestedAt: '2026-10-16T17:24:46.889Z'
---

## Overview

MariaDB server is a community developed fork of MySQL server. From 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ST_Area reads beyond the allocated buffer when processing invalid WKB for a MultiPolygon because the multi-polygon parser advances past a nested geometry header without first verifying enough input remains. A low-privileged remote attacker can supply malformed spatial data to disclose memory useful for bypassing ASLR as part of a multi-vulnerability chain. This issue is fixed in versions 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.

## Affected

- `server >= 10.6.1, < 10.6.28`
- `server >= 10.11.1, < 10.11.19`
- `server >= 11.4.1, < 11.4.13`
- `server >= 11.8.1, < 11.8.9`
- `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.