High7.4Red Hat Linux

High [CVE-2026-53791] rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header

This high-severity Red Hat Linux advisory covers CVE-2026-53791 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4.

CVE-2026-53791 Published Aug 13, 2026Updated by vendor Aug 13, 2026

CVE-2026-53791

Affected products & platforms

Red Hat LinuxRed Hat Enterprise Linux

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Summary

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. This allows unauthorized access to restricted resources.

Note: Red Hat Enterprise Linux 8 and earlier versions do not contain the vulnerable PROXY protocol implementation and are not affected. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

Weakness: CWE-290. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.

Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: rsync.

Affected versions

< 3.5.0

Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source

Fixed versions

3.5.0

Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Restrict rsync daemon TCP/873 to the trusted proxy only (CME-202). If PROXY protocol is unused, leave proxy protocol disabled (the default).

Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source

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