Buffer overflow in Mariadb Server
CVE-2026-85746
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_AsText can write beyond an allocated output buffer when converting deeply nested GeometryCollections because recursive WKT serialization does not account for bytes consumed or reserve sufficient space. A low-privileged remote attacker can submit a specially crafted GIS object to corrupt memory and potentially achieve code execution when combined with another vulnerability. 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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Mariadb Server — versions >= 10.11.1, < 10.11.19, >= 10.6.1, < 10.6.28, >= 11.4.1, < 11.4.13
Weakness classification (CWE)
References
- github.com/MariaDB/server/security/advisories/GHSA-8fvj-c57c-pggx
- github.com/MariaDB/server/commit/5c04ca5524385356ff7cf84974a7d491974c1f85
- github.com/MariaDB/server/releases/tag/mariadb-10.11.19
- github.com/MariaDB/server/releases/tag/mariadb-10.6.28
- github.com/MariaDB/server/releases/tag/mariadb-11.4.13
- github.com/MariaDB/server/releases/tag/mariadb-11.8.9
- github.com/MariaDB/server/releases/tag/mariadb-12.3.3
- github.com/MariaDB/server/releases/tag/mariadb-13.0.2
- jira.mariadb.org/browse/MDEV-40329
Frequently asked questions
- What is CVE-2026-85746?
- CVE-2026-85746 is a critical-severity vulnerability in Mariadb Server, classified under Out-of-bounds Write. CVSS score: 9.9/10. Published 2026-10-16.
- How severe is CVE-2026-85746?
- Critical severity. CVSS v3 base score is 9.9 out of 10.