MariaDB Server: Out-of-bounds write in CONNECT engine DOS tables
Summary
MariaDB Server's CONNECT engine, when handling DOS table types, uses an incorrect boundary check that allows a one-byte null write beyond a stack buffer at an attacker-controlled offset. An authenticated user who can use the CONNECT engine can cause a crash and, according to the vendor, potentially remote code execution; the vendor demonstrated code execution only under lab conditions. The attack complexity is rated high.
Affected
- MariaDB Server 10.6.1 to 10.6.27
- MariaDB Server 10.11.1 to 10.11.18
- MariaDB Server 11.4.1 to 11.4.12
- MariaDB Server 11.8.1 to 11.8.8
- MariaDB Server 12.3.1 to 12.3.2
- MariaDB Server 13.0.1
Fixed in
- 10.6.28
- 10.11.19
- 11.4.13
- 11.8.9
- 12.3.3
- 13.0.2
Workaround
- Uninstall or do not load the CONNECT engine plugin if it is not needed.
- Distribution packages may lag behind upstream; check your vendor's status.
Exploitation
- No confirmed in-the-wild exploitation reported.
- No public exploit found; the vendor demonstrated code execution only under lab conditions.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- EPSS of one aggregator: 0.01381 (unverified).
Our recommendation
- Inventory MariaDB versions and check whether the CONNECT plugin is installed and loaded.
- Upgrade to the fixed release for your branch as a priority.
- If CONNECT is not needed, uninstall the plugin.
- Ensure database ports are not exposed to the internet and use least-privilege accounts.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-4wgx-ffg9-jrwq github.com
- MariaDB fix commit b369925 github.com
- MariaDB Jira MDEV-40637 jira.mariadb.org
- MariaDB 10.6.28 release notes mariadb.com
- MariaDB 11.4.13 release notes mariadb.com
- Debian Security Tracker CVE-2026-107815 security-tracker.debian.org
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 11:01.
Original description (NVD)
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.
NVD references (9)
- https://github.com/MariaDB/server/commit/b369925f6855d3e1f0ebcf453492724b99fda6f8
- https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19
- https://github.com/MariaDB/server/releases/tag/mariadb-10.6.28
- https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13
- https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9
- https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3
- https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2
- https://github.com/MariaDB/server/security/advisories/GHSA-4wgx-ffg9-jrwq
- https://jira.mariadb.org/browse/MDEV-40637
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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