CVE-2026-43617: Samba Rsync

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.

Affected products

• Samba Rsync: up to and including 3.4.2

Published 2026-05-20. Last modified 2026-07-24.