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CVE-2026-53791

9.1 critical SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.1 · sambaNVD modified 2026-10-23 18:10

Affected (CPE criteria) 1

  • cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*

References 3