VULNERABILITY INTELLIGENCE

CVE-2026-53791

CVSS score9.1 CRITICAL

EPSS probability0.50%

CISA KEVNot currently listed

Published2026-08-13

Last modified2026-10-24

Description

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.