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CVE-2026-3494: MariaDB Server Audit Plugin Comment Handling Bypass

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-03 · updated 2026-10-20
• Weakness: CWE-778

Description

In MariaDB server version through 11.8.5, when server audit plugin is enabled with server_audit_events variable configured with QUERY_DCL, QUERY_DDL, or QUERY_DML filtering, if an authenticated database user invokes a SQL statement prefixed with double-hyphen (—) or hash (#) style comments, the statement is not logged.

Affected products

• Amazon Aurora MySQL: through 2.12.5; from 3.01.0 before 3.04.6; from 3.05.1 through 3.10.2; 3.11.0 — fixed in 3.04.6
• Amazon Relational Database Service: through 5.7.44-rds.20251212; through 10.6.24; from 8.0.11 through 8.0.44; from 8.4.3 through 8.4.7; from 10.11.4 through 10.11.15; from 11.4.3 through 11.4.9
• MariaDB: through 10.6.24; from 10.7.0 through 10.11.15; from 11.0.0 through 11.4.9; from 11.5.0 through 11.8.5

How to fix

Upgrade to a fixed version: Amazon Aurora MySQL 3.04.6. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-006-AWS/
• https://github.com/MariaDB/server/commit/635559a2ad68a5a6d1a354e8209c58323dba0261
• https://github.com/aws/audit-plugin-for-mysql/commit/01e25a5cb1073f131eea774c06c8a056b1e4b2ff

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