hMailServer Vulnerability in PostgreSQL Connection and Certificate Handling
CVE-2026-126609

7.5HIGH

Key Information:

Vendor

Progressive Robot Ltd

Status
Hmailserver
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126609?

This vulnerability impacts hMailServer versions 6.2.25 through 6.3.7 on Windows when using PostgreSQL with certain SSL configurations. A local attacker can manipulate the certificate file utilized by hMailServer, allowing them to impersonate a legitimate certificate authority and intercept or modify traffic exchanged between hMailServer and its PostgreSQL database. This includes sensitive information, such as database passwords. The misconfiguration of SSL modes and the way filenames are handled lead to this security risk. It's crucial to ensure that the correct SSL configuration is enforced to prevent potential exploitation.

Affected Version(s)

hMailServer 6.2.25 <= 6.3.7

References

https://gitlab.com/hmailserver/hmailserver/-/work_items/114
https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.8

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Found by the hMailServer project (Progressive Robot Ltd)
.