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VULNERABILITIES

CVE-2026-53791 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 [email protected]ProductRelease Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-h2q9-5fr8-w635 [email protected]Vendor Advisory
https://www.vulncheck.com/advisories/rsync-daemon-ip-spoofing-via-proxy-protocol-header [email protected]Release NotesThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-290Authentication Bypass by Spoofing[email protected]

Affected Products

ProductVersions
samba rsync
< 3.5.0

CPE

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

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-53791
NVD Published Date:
Aug 13, 2026
NVD Last Modified:
Aug 31, 2026
Source:
[email protected]
CVE-2026-53791 Details - Not Deferred