Bug 2515387 (CVE-2026-53791) - CVE-2026-53791 rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
Summary: CVE-2026-53791 rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
Keywords:
Status: NEW
Alias: CVE-2026-53791
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2520902
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 15:51 UTC by OSIDB Bzimport
Modified: 2026-08-21 08:22 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-08-13 15:51:12 UTC 
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.
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