Vulnerabilities CVE-2026-43617

CVE-2026-43617

Medium

Open

TLP:CLEAR

Rsync < 3.4.3 Authorization Bypass via Hostname Resolution

NVD CVE.org

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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.

Details

CVSS Score: 6.3
EPSS Score ⓘ: 0.28%

20.4th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: May 20, 2026
Last Modified: Jul 14, 2026

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