Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Samba | Rsync | < 3.5.0 |
Related Weaknesses (CWE)
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0ProductRelease Notes
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-h2q9-5fr8-w635Vendor Advisory
- https://www.vulncheck.com/advisories/rsync-daemon-ip-spoofing-via-proxy-protocolRelease NotesThird Party Advisory
FAQ
What is CVE-2026-53791?
CVE-2026-53791 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 ...
How severe is CVE-2026-53791?
CVE-2026-53791 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-53791?
Check the references section above for vendor advisories and patch information. Affected products include: Samba Rsync.