Vulnerability in hMailServer Affects MySQL and MariaDB Database Connections
CVE-2026-126610

7.4HIGH

Key Information:

Vendor

Progressive Robot Ltd

Status
Hmailserver
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126610?

The vulnerability in hMailServer versions 6.3.4 through 6.3.7 stems from inadequate handling of TLS connection settings with MySQL or MariaDB databases. When using non-ASCII character filenames for the certificate authority (CA) file on Linux, or names above U+00FF on Windows, the server fails to communicate the necessary CA file to the database client. This allows an attacker to intercept and manipulate the traffic between hMailServer and the database by presenting a fraudulent certificate. Additionally, depending on the client version, this mishandling can enable unauthorized access to sensitive data, as it bypasses critical certificate validations and allows potential local exploit scenarios. The issue accentuates the need for proper TLS configuration and rigorous security measures in database interactions.

Affected Version(s)

hMailServer 6.3.4 <= 6.3.7

References

https://gitlab.com/hmailserver/hmailserver/-/work_items/112
https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.8

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Found by the hMailServer project (Progressive Robot Ltd)
.