Vulnerability · Published Oct 9, 2026 · Assigned by GitHub_M

CVE-2026-107815MariaDB: one byte OOB write in DOS tables of the CONNECT engine

High 8.5

In plain English

A high-severity out-of-bounds write 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 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.5High

Exploit odds (30 days)1.4%top 27.7% 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, the CONNECT engine's DOS table type used an incorrect boundary check that permitted a one-byte null write beyond a stack buffer at an attacker-controlled offset. An authenticated user able to use the CONNECT engine could cause a crash and potentially remote code execution. 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-2026-107815
Debian:13	mariadb	no fix listed	DEBIAN-CVE-2026-107815
Debian:14	mariadb	1:11.8.9+ds-1	DEBIAN-CVE-2026-107815
Ubuntu:24.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-107815
Ubuntu:26.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-107815
Ubuntu:26.10	mariadb	no fix listed	UBUNTU-CVE-2026-107815
Ubuntu:22.04:LTS	mariadb-10.6	no fix listed	UBUNTU-CVE-2026-107815

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-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/MariaDB/server/security/advisories/GHSA-4wgx-ffg9-jrwq x_refsource_CONFIRM
https://github.com/MariaDB/server/commit/b369925f6855d3e1f0ebcf453492724b99fda6f8 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-40637 x_refsource_MISC