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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-43617

Rsync < 3.4.3 Authorization Bypass via Hostname Resolution

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

RsyncProject rsync

Default version status: unaffected

  • 0 to < 3.4.3affected
pkg:github/RsyncProject/rsync

References