# CVE-2026-107818: MariaDB environment injection via wsrep bootstrap in service file

Source: https://junglewise.ai/threats/cve-2026-107818-mariadb-server-is-a-community-developed-fork-of-mysql-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-107818 · Severity: high · CVSS 8.4 · Published 2026-10-09

MariaDB Server, a database server commonly used in web applications and infrastructure, is vulnerable to environment variable injection during cluster bootstrap restarts. A database user with FILE privilege can write a malicious file that gets read during service restart, potentially allowing arbitrary code execution or service compromise.

Technologies: [Mariadb](https://junglewise.ai/threats/technologies/mariadb), [Mariadb Server](https://junglewise.ai/threats/technologies/mariadb-mariadb-server). Vendors: [Mariadb](https://junglewise.ai/threats/vendors/mariadb).

## Quick answers

**Is CVE-2026-107818 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107818 being exploited in the wild.

**How severe is CVE-2026-107818?** High severity, with a CVSS score of 8.4, published 9 October 2026.

**Which products and versions are affected?** Mariadb Server 10.6.1 to 10.6.27, 10.11.0 to 10.11.18, 11.4.0 to 11.4.12, 11.8.0 to 11.8.8, 12.3.0 to 12.3.2, 13.0.0 to 13.0.1.

**Is there a fix for CVE-2026-107818?** Yes: fixed in 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-107818 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-107818?** Check whether you run Mariadb or Mariadb Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2

## Technical details

A local privilege escalation vulnerability exists in MariaDB's systemd service file handling of wsrep (Galera cluster) bootstrap. An authenticated database user with FILE privilege can create a specially-crafted file at /run/mysqld/wsrep-new-cluster, which the service reads and uses to inject environment variables on restart. The vulnerability requires FILE privilege and a permissive secure-file-priv configuration.

## Affected products

- MariaDB Server 10.6.1 to 10.6.27, 10.11.0 to 10.11.18, 11.4.0 to 11.4.12, 11.8.0 to 11.8.8, 12.3.0 to 12.3.2, 13.0.0 to 13.0.1

## Timeline

- 2026-10-09: disclosed

## References

- [https://github.com/MariaDB/server/commit/e3d62d4e78fd4941cef3f5053e6a50d0b32d740e](https://github.com/MariaDB/server/commit/e3d62d4e78fd4941cef3f5053e6a50d0b32d740e)
- [https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19](https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19)

## Related threats

- [MariaDB server privilege escalation in view FRM parser](https://junglewise.ai/threats/cve-2026-107823-mariadb-server-is-a-community-developed-fork-of-mysql-server)
- [MariaDB ACL cache privilege escalation via role collision](https://junglewise.ai/threats/cve-2026-107822-mariadb-server-is-a-community-developed-fork-of-mysql-server)
- [MariaDB server buffer overflow in FRM metadata validation](https://junglewise.ai/threats/cve-2026-107821-mariadb-server-is-a-community-developed-fork-of-mysql-server)
- [MariaDB mysql_json plugin out-of-bounds read](https://junglewise.ai/threats/cve-2026-107817-mariadb-server-is-a-community-developed-fork-of-mysql-server)
- [MariaDB qc_info plugin out-of-bounds read on embedded null bytes](https://junglewise.ai/threats/cve-2026-107816-mariadb-server-is-a-community-developed-fork-of-mysql-server)