CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-53791 — rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that all...

·Source: NIST NVD

Updated:

Executive 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 a

Analysis

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. CVSS Score: 9.1. Published: 2026-08-13T15:19:43.363.

Indicators of Compromise (1)

CVE (1)
CVE-2026-53791
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 13, 2026. Verified by: NIST.

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