P4Verified

CVE-2026-103649: hMailServer 6.3.0 to before 6.3.6

CVE-2026-103649. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA).

Affected technology

hMailServer · 6.3.0 to before 6.3.6
Progressive Robot Ltd

Description’s affected range: through 6.3.5

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A remote attacker can hold server threads indefinitely and so stop outbound mail delivery (denial of service). Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.

Published 2026-10-08 17:34:54.342048+00:00

CWE: CWE-1088
CCR priority: 30.0 /100 (P4)
CVSS 3.1: 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
KEV: no

Provenance

GitHub Advisory Database · Source record · observed 2026-10-08 18:27:24.781324+00:00 UTC
NVD CVE API 2.0 · Source record · observed 2026-10-08 17:32:11.049884+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-103649.html