CVE-2026-53791
rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 |
| Vendor | rsyncproject |
| Product | rsync |
| Published | Aug 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
RsyncProject / rsync
0 ≤ 3.4.4