CVE-2026-107579 Progressive Robot hMailServer - Denial of Service

Progressive Robot hMailServer 6.3.4 and 6.3.5 contain a denial of service caused by inefficient algorithmic complexity in bounce and complaint processing, letting remote unauthenticated attackers stop mail delivery by sending crafted messages, exploit requires bounce or complaint processing enabled or mailing list managed.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-407

Vendor fix

Update to a version later than 6.3.5 or latest available version.

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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