Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

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

Medium 4.3

In plain English

A medium-severity security flaw in server from MariaDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.5%top 54.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	mariadb	no fix listed	DEBIAN-CVE-2026-85745
Debian:13	mariadb	no fix listed	DEBIAN-CVE-2026-85745
Debian:14	mariadb	1:11.8.9+ds-1	DEBIAN-CVE-2026-85745
Ubuntu:24.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-85745
Ubuntu:26.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-85745
Ubuntu:26.10	mariadb	no fix listed	UBUNTU-CVE-2026-85745
Ubuntu:22.04:LTS	mariadb-10.6	no fix listed	UBUNTU-CVE-2026-85745

Affected products (as reported)

Vendor	Product	Versions
MariaDB	server	>= 10.6.1, < 10.6.28>= 10.11.1, < 10.11.19>= 11.4.1, < 11.4.13>= 11.8.1, < 11.8.9>= 12.3.1, < 12.3.3>= 13.0.1, < 13.0.2

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/MariaDB/server/security/advisories/GHSA-p7v9-24h4-mch8 x_refsource_CONFIRM
https://github.com/MariaDB/server/commit/2bf355e361db85153fdfba7b8a0f0d114d6a26ce x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-10.6.28 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2 x_refsource_MISC
https://jira.mariadb.org/browse/MDEV-40328 x_refsource_MISC