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CVE-2026-104658: hMailServer

Severity

7.8 (HIGH)

Vendor

PROGRESSIVE ROBOT LTD

Affected versions

6.3.4 through before 6.3.6

Patch status

Unknown

Published

2026-10-08T11:16:43.870

Modified

2026-10-08T11:16:43.870

Why it matters

High-severity vulnerability requiring prioritized review.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Compare installed versions against the affected version range in the advisory.

Technical summary

The Linux live-update apply helper (hmailserver-update) of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileged hmailserver service account, and took from that request the program used to verify an AppImage update's signature and the systemd unit to stop before reading the service account's files. An attacker who already runs code as the hmailserver service account, for example through another flaw in the mail server, can therefore have arbitrary code executed as root, on any Linux installation where the live update's path unit is active – the default for the project's .deb and .rpm packages – and on AppImage installations run under that unit.

View the official NVD record for CVE-2026-104658

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.