CVE-2026-53791 — rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
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 PROX…
Published: 2026-08-13 · CVSS: 9.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7