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CVE-2026-85745— MariaDB: Out-of-bound buffer read on in `ST_Area` of a multipolygon.

Quick assessment

Affected
MariaDB server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MariaDB 服务器是 MySQL 服务器由社区开发的一个分支。在版本 10.6.1 至 10.6.28、10.11.19、11.4.13、11.8.9、12.3.3 和 13.0.2 中，当处理无效的 WKB（Well-Known Binary）多面体（MultiPolygon）数据时，ST_Area 函数会读取超出已分配缓冲区的数据。这是因为多面体解析器在确认剩余输入数据是否足够之前，就提前跳过了嵌套几何体的头部信息。低权限的远程攻击者可利用构造畸形的空间数据，泄露内存信息，从而作为多漏洞组合攻击的一部分，绕

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
MariaDB server >= 10.6.1, < 10.6.28 affected
>= 10.11.1, < 10.11.19 affected
>= 11.4.1, < 11.4.13 affected
>= 11.8.1, < 11.8.9 affected
>= 12.3.1, < 12.3.3 affected
>= 13.0.1, < 13.0.2 affected
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I. Basic Information for CVE-2026-85745

Vulnerability Information
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Vulnerability Title
MariaDB: Out-of-bound buffer read on in `ST_Area` of a multipolygon.
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MariaDB server >= 10.6.1, < 10.6.28 -

II. Public POCs for CVE-2026-85745

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III. Intelligence Information for CVE-2026-85745

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Patches & Fixes for CVE-2026-85745 (2)

Vendor Advisories for CVE-2026-85745 (1)

Vendor Pages for CVE-2026-85745 (4)

Other References for CVE-2026-85745 (1)

Same Patch Batch · MariaDB · 2026-10-16 · 7 CVEs total

CVE-2026-85748 9.9 CRITICAL MariaDB: Use-after-free with a large number of SYS_REFCURSOR's
CVE-2026-85746 9.9 CRITICAL MariaDB: Out-of-bound buffer write on in `ST_AsText` of nested GeometryCollections
CVE-2026-92262 9.9 CRITICAL MariaDB: Numerous issues caused by historical #mysql50# tablename encoding bypass.
CVE-2026-97380 8.8 HIGH MariaDB: GRANT PROXY with empty password incorrectly checks grantor's privileges
CVE-2026-86047 7.7 HIGH MariaDB: Insufficient quoting in mariadb-dump and SHOW commands
CVE-2026-85985 5.4 MEDIUM MariaDB: Unauthorized file access via CONNECT engine UDFs

IV. Related Vulnerabilities

Same product: server
Same vendor: MariaDB
Same weakness: CWE-126

V. Comments for CVE-2026-85745

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