CVE-2026-107584 Progressive Robot hMailServer - Man-in-the-Middle

Progressive Robot hMailServer 6.0.0 through 6.3.5 contains a misconfiguration in DANE implementation caused by improper DNSSEC validation in the DNS resolver, letting attackers on the DNS or SMTP path disable DANE and intercept or modify emails, exploit requires attacker to control or manipulate DNS responses and be active on SMTP path.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.15% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Man-in-the-Middle
Impact
Man In The Middle, Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-636

Vendor fix

Update to the latest hMailServer version with proper DNSSEC validation and DANE enforcement.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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